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Zebrafish have also been found to regenerate [[photoreceptor cells]] and [[retina]]l neurons following injury. The mechanisms of this regeneration are unknown. Researchers frequently [[amputate]] the dorsal and ventral tail fins and analyze their regrowth to test for mutations. This research is leading the scientific community in the understanding of healing/repair mechanisms in vertebrates. It has also been found if the same fin is damaged enough times, the fish will grow a new fin which will have mutated only a small amount. Most scientists believe this is a defence mechanism to try to prevent the fin from being damaged again.{{Citation needed|date=June 2010}}
 
Zebrafish have also been found to regenerate [[photoreceptor cells]] and [[retina]]l neurons following injury. The mechanisms of this regeneration are unknown. Researchers frequently [[amputate]] the dorsal and ventral tail fins and analyze their regrowth to test for mutations. This research is leading the scientific community in the understanding of healing/repair mechanisms in vertebrates. It has also been found if the same fin is damaged enough times, the fish will grow a new fin which will have mutated only a small amount. Most scientists believe this is a defence mechanism to try to prevent the fin from being damaged again.{{Citation needed|date=June 2010}}
   
===Genetics===
 
====Gene expression====
 
A common [[reverse genetics]] technique is to [[gene knockdown|reduce gene expression]] or modify [[Splicing (genetics)|splicing]] using [[Morpholino]] [[antisense]] technology. Morpholino [[oligonucleotide]]s (MO) are stable, synthetic [[macromolecules]] that contain the same [[nucleosides|bases]] as DNA or RNA; by binding to complementary RNA sequences, they reduce the [[gene expression|expression]] of specific genes. The journal ''Genesis''<ref>
 
[http://www3.interscience.wiley.com/cgi-bin/jhome/68503812 genesis - The Journal of Genetics and Development]</ref> devoted an issue<ref>
 
{{cite journal |title=Zebrafish issue |journal=Genesis |volume=30 |issue=3 |year=2001 |month=July |url=http://www3.interscience.wiley.com/cgi-bin/jissue/85006212}}</ref> to research using MO, mostly in ''D. rerio''. MO can be injected into one cell of an embryo after the 32-cell stage, reducing gene expression in only cells descended from that cell. However, cells in the early embryo (less than 32 cells) are interpermeable to large molecules,<ref name=blast2>{{
 
cite journal |author=Kimmel CB, Law RD |title=Cell lineage of zebrafish blastomeres. I. Cleavage pattern and cytoplasmic bridges between cells |journal=Dev Biol. |volume=108 |issue=1 |pages=78–85 |year=1985 |month=March |pmid=3972182 |url=http://linkinghub.elsevier.com/retrieve/pii/0012-1606(85)90010-7 |doi=10.1016/0012-1606(85)90010-7}}</ref><ref name=blast4>{{
 
cite journal |author=Kimmel CB, Law RD |title=Cell lineage of zebrafish blastomeres. III. Clonal analyses of the blastula and gastrula stages |journal=Dev Biol. |volume=108 |issue=1 |pages=94–101 |year=1985 |month=March |pmid=3972184 |url=http://linkinghub.elsevier.com/retrieve/pii/0012-1606(85)90012-0 |doi=10.1016/0012-1606(85)90012-0}}</ref> allowing diffusion between cells. A known problem with gene knockdowns is that, because the genome underwent a [[genome#Genome evolution|duplication]] after the divergence of [[ray-finned fish]]es and [[lobe-finned fish]]es, it is not always easy to silence the activity one of the two gene [[paralog]]s reliably due to [[Complementation (genetics)|complementation]] by the other paralog.
 
   
Despite the complications of the zebrafish [[genome]], a number of commercially available global platforms for analysis of both gene expression by [[expression profiling|microarrays]] and promoter regulation using [[ChIP-on-chip]] exist.
 
   
====Gene sequencing====
 
In 2009, researchers at the [[Institute of Genomics and Integrative Biology]], [[Delhi]] announced the sequencing of a wild caught strain, containing 1.7 billion
 
genetic letters.<ref>
 
[http://www.indianexpress.com/news/Decoding-the-Genome-Mystery/485122 Decoding the Genome Mystery] [[Indian Express]], July 5, 2009.</ref><ref>
 
[http://genome.igib.res.in Genome@IGIB ] [[Institute of Genomics and Integrative Biology]] (IGIB)</ref>
 
   
====Mitochondrial DNA====
 
In October 2001, researchers from the [[University of Oklahoma]] published ''D. rerio's'' complete [[mitochondrial DNA]] sequence.<ref>
 
{{cite journal
 
|url=http://genome.cshlp.org/content/11/11/1958.full
 
|author=Broughton RE, Milam JE, Roe BA |title=The complete sequence of the zebrafish (Danio rerio) mitochondrial genome and evolutionary patterns in vertebrate mitochondrial DNA |journal=Genome Res |volume=11 |pages=1958–67 |year=2001 |month=October |pmid=11691861
 
|doi=10.1101/gr.156801
 
|issue=11
 
|pmc=311132 }}</ref> Its length is 16,596 base pairs. This is within 100 base pairs of other related species of fish, and it is notably only 18 pairs longer than the [[goldfish]] (''Carassius auratus'') and 21 longer than the [[carp]] (''Cyprinus carpio''). Its gene order and content is identical to the common [[vertebrate]] form of mitochondrial DNA. It contains 13 [[protein]]-coding genes and a noncoding control region containing the [[origin of replication]] for the heavy strand. In between a grouping of five [[tRNA]] genes, a sequence resembling vertebrate origin of light strand replication is found. It is difficult to draw evolutionary conclusions because it is difficult to determine whether base pair changes have adaptive significance via comparisons with other vertebrates [[nucleotide]] sequences.
 
 
====Pigmentation gene====
 
In December 2005, a study of the ''golden'' strain identified the gene responsible for its unusual pigmentation as [[SLC24A5]], a [[Solution|solute]] carrier that appeared to be required for [[melanin]] production, and confirmed its function with a Morpholino knockdown. The [[Orthologue|orthologous]] gene was then characterized in humans and a one base pair difference was found to strongly segregate fair-skinned Europeans and dark-skinned Africans.<ref>{{
 
cite journal |author=Lamason RL, Mohideen MA, Mest JR, ''et al.'' |title=SLC24A5, a putative cation exchanger, affects pigmentation in zebrafish and humans |journal=Science |volume=310 |issue=5755 |pages=1782–6 |year=2005 |month=December |pmid=16357253 |doi=10.1126/science.1116238 }}</ref> <!-- this article is on fish, not on studies...This study featured on the cover of the [[academic journal]] [[Science (journal)|''Science'']] and demonstrates the power of zebrafish as a model organism in the relatively new field of [[comparative genomics]].-->
 
 
====Transgenesis====
 
Transgenesis is a popular approach to study the function of genes in zebrafish. Construction of transgenic zebrafish is rather easy by a method using the Tol2 transposon system.<ref>{{cite journal |doi=10.1016/j.devcel.2004.06.005 |author=Kawakami, K, ''et al.'' |title=A transposon-mediated gene trap approach identifies developmentally regulated genes in zebrafish |journal=Developmental Cell |volume=7 |issue=1 |pages=133–144 |year=2004 |pmid=15239961 }}</ref>
 
 
==In environmental monitoring==
 
===Oestrogen detection===
 
In January 2007, [[China|Chinese]] researchers at [[Fudan University]] genetically modified fish to detect [[oestrogen]] pollution in lakes and rivers, which is linked to male infertility.<ref>Song Houyan and Zhong Tao, professors at Fudan's molecular medicine lab, spent three years cloning estrogen-sensitive genes and injecting them into the fertile eggs of zebrafish. The modified fish turn green if they are placed into water that is polluted by estrogen. [http://news.xinhuanet.com/english/2007-01/12/content_5597696.htm Fudan scientists turn fish into estrogen alerts]</ref>
 
   
 
==In medical research==
 
==In medical research==
   
In cardiovascular research the zebrafish is being used to model [[Coagulation|blood clotting]], [[Angiogenesis|blood vessel development]], [[heart failure]], and [[congenital heart defect|congenital heart disease]]. In programmes of research into acute [[inflammation]], a major underpinning process in many diseases, researchers have established a zebrafish model of inflammation, and its resolution. An approach that allows detailed study of the genetic controls of inflammation and the possibility of identifying potential new drugs.
+
In cardiovascular research the zebrafish is being used to model [[Coagulation|blood clotting]], [[Angiogenesis|blood vessel development]], [[heart failure]], and [[congenital heart defect|
 
Another focus of work is to understand how a gene called [[Hedgehog (gene)|Hedgehog]], a biological signal that underlies a number of human cancers, controls cell growth. This is fast becoming an avenue of research that is leading to new cancer therapies.
 
In probing disorders of the nervous system, including neurodegenerative diseases, movement disorders, psychiatric disorders and deafness, researchers are using the zebrafish to understand how the genetic defects underlying these conditions cause functional abnormalities in the human brain, spinal cord and sensory organs.
 
Researchers are delving into the complexities of muscle degeneration in genetic models of human musculoskeletal diseases, such as muscular dystrophy.
 
 
These studies exemplify how zebrafish research offers unique opportunities to understanding some of the greatest challenges in medical science, by enabling new discoveries of how cells and tissues work to be translated into new ways of understanding a broad range of human diseases.
 
 
Finally, and as demonstrated through ongoing research programmes, the zebrafish models affords an ideal opportunity, not only to identify novel candidates for genes underlying human disease, but offers a potential system in which to begin to develop novel therapeutic agents in drug discovery programmes, hence helping to identify new treatments.<ref>{{cite web |url=http://www.fishforscience.com/ |title=Fish for Science |publisher=University of Sheffield |year=2011 |accessdate=2011-03-19 }}</ref>
 
   
 
===Repairing retinal damage===
 
===Repairing retinal damage===
Line 199: Line 168:
 
[http://www.chinapost.com.tw/health/eye%20health/2007/08/03/116860/Zebra-fish.htm Zebra fish may point way to cure for blindness] [[The China Post]] Friday, August 3, 2007.</ref>
 
[http://www.chinapost.com.tw/health/eye%20health/2007/08/03/116860/Zebra-fish.htm Zebra fish may point way to cure for blindness] [[The China Post]] Friday, August 3, 2007.</ref>
   
===Transparent adult bodies===
 
In 2008, researchers at [[Children's Hospital Boston]] developed a new strain of zebrafish, named Casper, whose adult bodies were transparent.<ref name=zviv>{{
 
cite journal |author=White RM, Sessa A, Burke C, ''et al.'' |title=Transparent adult zebrafish as a tool for in vivo transplantation analysis |journal=[[Cell Press|Cell Stem Cell]] |volume=2 |issue=2 |pages=183–9 |year=2008 |month=February |pmid=18371439 |pmc=2292119 |doi=10.1016/j.stem.2007.11.002 }}</ref> This allows for detailed visualization of cellular activity, circulation, [[metastasis]] and many other phenomena. Because many gene functions are shared between fish and humans, Casper is expected to yield insight into human diseases such as leukemia and other cancers.<ref name=zviv/><ref>
 
[http://www.livescience.com/animals/080206-see-thru-fish.html livescience.com]</ref>
 
   
 
==See also==
 
==See also==
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[[Category:Model organisms]]
 
[[Category:Model organisms]]
 
[[Category:Cold-water aquarium fish]]
 
[[Category:Cold-water aquarium fish]]
[[Category:Danios]]
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[[az:Danio rerio]]
 
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?Danio rerio
File:Zebrafisch.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Cyprinidae
Genus: Danio
Species: D. rerio
Binomial name
Danio rerio
(Hamilton, 1822)
Synonyms
  • Barilius rerio
  • Brachydanio rerio
  • Cyprinus chapalio
  • Cyprinus rerio
  • Danio foankei
  • Danio lineatus
  • Nuria rerio
  • Perilampus striatus

The zebrafish, Danio rerio, is a tropical freshwater fish belonging to the minnow family (Cyprinidae) of order Cypriniformes.[1] It is a popular aquarium fish, frequently sold under the trade name zebra danio, and is an important vertebrate model organism in scientific research.

TaxonomyEdit

The zebrafish are Cyprinidae with a derived member of the genus Danio. It has a sister group relationship with Danio kyathit.[2]

Zebrafish are closely related to the genus Devario, as demonstrated by a phylogenetic tree of close species. Figure 2. Phylogenetic relationships among danios.

DistributionEdit

The zebrafish is native to the streams of the southeastern Himalayan region,[2] including the countries India, Pakistan, Bangladesh, Nepal, and Myanmar.[3] It arose in the Ganges region in Eastern India. It commonly inhabits streams, canals, ditches, ponds, and slow-moving to stagnant water bodies, including rice fields.[4]

Zebrafish have been introduced to parts of the United States, presumably by deliberate release or by escape from fish farms.[3] They have also been sighted in Colombia.

DescriptionEdit

File:Zebrafish95-300.jpg

The fish is named for the five uniform, pigmented, horizontal blue stripes on the side of the body, all of which extend to the end of the caudal fin. Its shape is fusiform and laterally compressed, with its mouth directed upwards. Males are torpedo-shaped and have gold stripes between the blue stripes; females have a larger, whitish belly and have silver stripes instead of gold. Adult females will exhibit a small genital papilla in front of the anal fin origin. The zebrafish can grow to Template:Convert/cmTemplate:Convert/test/A, although it is uncommon for them to grow past 4 cm in captivity. Life-span in captivity is around 2–3 years, although in ideal conditions, may extend to 5 years.[4]

ReproductionEdit

The approximate generation time for the Danio is 3–4 months. A male must be present for ovulation and spawning to occur. Females are able to spawn at intervals of 2–3 days, laying hundreds of eggs in each clutch. Upon release, embryonic development begins; absent sperm, growth stops after the first few cell divisions. Fertilized eggs almost immediately become transparent, a characteristic that makes D. rerio a convenient research model species.[4] Development progresses rapidly. Precursors to all major organs appear within 36 hours of fertilization. Hatching takes place 48–72 hours after fertilization, depending on the embryo's internal conditions and the external temperature, ideally Template:C to F. Swimming and feeding behavior begin about 36 hours later. The sex of juveniles cannot be distinguished except by dissection, and sex determinants are not clearly understood.

FeedingEdit

The zebrafish is omnivorous. It primarily eats zooplankton, insects and insect larvae, and phytoplankton. It can eat a variety of other foods, such as worms and small crustaceans if its preferred sources are not readily available.[4] Most Danios accept common food flakes and tubifex worms in the aquarium.

StrainsEdit

Recently, transgenic zebrafish have become commercially available that express green fluorescent protein, red fluorescent protein, and yellow fluorescent protein. They are tradenamed GloFish. Other subspecies include golden, sandy, longfin and leopard.

The leopard danio, previously known as Danio frankei, is a spotted colour morph of the zebrafish caused by a pigment mutation.[5] Xanthistic forms of both the zebra and leopard pattern, along with long-finned subspecies, have been obtained via selective breeding programs for the aquarium trade.[6]

Wild-type strainsEdit

The Zebra Fish Information Network[7] provides up-to-date information about current known wild-type (WT) strains of D. rerio. The most commonly found WT strains are: AB, TÜ, IN and WIK.

AB (AB)
AB/C32 (AB/C32)
AB/TL (AB/TL)
AB/Tuebingen (AB/TU)
C32 (C32)
Cologne (KOLN)
Darjeeling (DAR)
Ekkwill (EKW)

HK/AB (HK/AB)
HK/Sing (HK/SING)
Hong Kong (HK)
India (IND)
Indonesia (INDO)
Nadia (NA)
RIKEN WT (RW)
Singapore (SING)

SJA (SJA)
SJD (SJD)
SJD/C32 (SJD/C32)
Tuebingen (TU)
Tupfel long fin (TL)
Tupfel long fin nacre (TLN)
WIK (WIK)
WIK/AB (WIK/AB)

HybridsEdit

Hybrids between different Danio species may be fertile: for example, between D. rerio and D. nigrofasciatus.[8]

See link for photos of hybrids: Figure 1. Danio pigment pattern diversity and phenotypes of D. rerio hybrids with other danios.

Aquarium careEdit

Zebrafish are hardy fish and considered good for beginner aquarists. Their ease of keeping and breeding, beauty, price, playful nature and broad availability all contribute to their popularity. They thrive best in Template:Convert/-Template:Convert/test/A water. They need an aquarium of Template:Convert/USgalTemplate:Convert/test/A or more, and they do well in schools. They also thrive as shoals of six or more, and interact well with other fish types in the aquarium. However, they are susceptible to Oodinium or velvet disease, microsporidia (Pseudoloma neurophilia), and Mycobacterium species. Given the opportunity, adults eat hatchlings, which may be protected by separating the two groups with a net, breeding box or separate tank.

In scientific researchEdit

Zfishchroma

Zebrafish chromatophores, shown here mediating background adaptation, are studied by scientists

D. rerio is a common and useful model organism for studies of vertebrate development and gene function.[2] George Streisinger at the University of Oregon established its utility. Success with it in large scale forward genetic screens (commonly referred to as the Tübingen/Boston screens) consolidated its importance. The scholarly journal Development[9] devoted an issue[10] to research using it in celebration of this landmark. It has a dedicated online database of genetic, genomic, and developmental information, the Zebrafish Information Network (ZFIN). D. rerio is one of the few fish species to have reached space. They may supplement higher vertebrate models, such as rats and mice.

File:Zebrafish embryos.png

Research with D. rerio has allowed advances in the fields of developmental biology, oncology,[12] toxicology,[13] reproductive studies, teratology, genetics, neurobiology, environmental sciences, stem cell and regenerative medicine,[14] and evolutionary theory.[8]

Attractive characteristicsEdit

Its greatest advantages for use as a model system include:

  • Fully-sequenced genome
  • Well understood, easily observable and testable developmental behaviors
  • Availability of well-characterized mutants

Other advantages:

  • Rapid embryonic development (progressing from eggs to larvae in under three days, although overall generation time is comparable to that of mice)
  • Large, robust, and transparent embryos that develop outside the mother[15]
  • Nearly constant size during early development facilitates simple staining techniques
  • Drugs may be administered by adding directly to the tank.
  • Unfertilized eggs can be made to divide
  • Two-celled embryo can be fused into a single cell, creating a homozygous embryo
  • Demonstrated similarity to mammalian models and humans in toxicity testing
  • Exhibits a diurnal sleep cycle with similarities to mammalian sleep behavior and physiology[16]

RegenerationEdit

Zebrafish have the ability to regenerate fins, skin, the heart[17] and the brain (in larval stages). Heart muscle regeneration does not make use of stem cells; instead, mature heart muscle cells regress to a stem-cell-like state and redifferentiate.[17] In 2011 the British Heart Foundation ran an advertising (including on television and online) campaign publicising their intention to study the applicability of this ability to humans by "spend[ing] £50 million on a programme of groundbreaking research that could help us begin to repair damaged [human] hearts."[18]

Zebrafish have also been found to regenerate photoreceptor cells and retinal neurons following injury. The mechanisms of this regeneration are unknown. Researchers frequently amputate the dorsal and ventral tail fins and analyze their regrowth to test for mutations. This research is leading the scientific community in the understanding of healing/repair mechanisms in vertebrates. It has also been found if the same fin is damaged enough times, the fish will grow a new fin which will have mutated only a small amount. Most scientists believe this is a defence mechanism to try to prevent the fin from being damaged again.[citation needed]



In medical researchEdit

In cardiovascular research the zebrafish is being used to model blood clotting, blood vessel development, heart failure, and [[congenital heart defect|

Repairing retinal damageEdit

In 2007, researchers at University College London grew a type of zebrafish adult stem cell found in the eyes of fish and mammals that develops into neurons in the retina—the part of the eye that sends messages to the brain. These cells could be injected in the eye to treat diseases that damage retinal neurons—nearly every disease of the eye, including macular degeneration, glaucoma, and diabetes-related blindness. Retinal damage is responsible for most cases of sight loss. The researchers studied Müller glial cells in the eyes of humans aged from 18 months to 91 years and were able to develop them into all types of retinal neurons. They were able to grow them easily in the lab. The stem cells successfully migrated into diseased rats' retinas and took on the characteristics of the surrounding neurons. The team is working on the same approach in humans.[19]


See alsoEdit

ReferencesEdit

  1. Template:FishBase species
  2. 2.0 2.1 2.2 Mayden, Richard L., Tang, Kevin L.; Conway, Kevin W.; Freyhof, Jörg; Chamberlain, Sarah; Haskins, Miranda; Schneider, Leah; Sudkamp, Mitchell; Wood Robert M.; Agnew, Mary; Bufalino, Angelo; Sulaiman, Zohrah; Miya, Masaki; Saitoh, Kenji; He, Shunping (2007). Phylogenetic relationships of Danio within the order Cypriniformes: a framework for comparative and evolutionary studies of a model species. J. Exp. Zool. (Mol. Dev. Evol.) 308B (5): 642–654.
  3. 3.0 3.1 USGS NAS - Nonindigenous Aquatic Species
  4. 4.0 4.1 4.2 4.3 Spence R, Gerlach G, Lawrence C, Smith C (February 2008). The behaviour and ecology of the zebrafish, Danio rerio. Biological Reviews 83 (1): 13–34.
  5. Watanabe M, Iwashita M, Ishii M, et al. (September 2006). Spot pattern of leopard Danio is caused by mutation in the zebrafish connexin41.8 gene. EMBO Rep. 7 (9): 893–7.
  6. Mills, Dick (1993). Eyewitness Hnbk Aquarium Fish, Harper Collins.
  7. ZFIN
  8. 8.0 8.1 Parichy, DM (September 2006). Evolution of danio pigment pattern development. Heredity 97 (3): 200–210.
  9. Development journal
  10. (December 1996). Zebrafish issue. Development 123 (1).
  11. See link for pigmentation mutants of D rerio: Figure 5. Pigment pattern mutants within D. rerio. Mutant names are shown along with gene identities in parentheses when known. For example, the picasso phenotype results from mutations in errb3
  12. Xiang J, et al. (February 2009). Identifying Tumor Cell Growth Inhibitors by Combinatorial Chemistry and Zebrafish Assays. PLoS ONE 4 (2): e4361.
  13. Hill AJ, Teraoka H, Heideman W & Peterson RE (July 2005). Zebrafish as a Model Vertebrate for Investigating Chemical Toxicity. Toxicological Sciences 86 (1): 6–19.
  14. Major RJ, Poss KD (2007). Zebrafish heart regeneration as a model for cardiac tissue repair. Drug Discov Today Dis Models 4 (4): 219–225.
  15. (2006). The Zebrafish Exposed. American Scientist 94 (5): 446–453.
  16. Jones, Rachel (16 October 2007), "Let Sleeping Zebrafish Lie: A New Model for Sleep Studies", PLoS Biology (Public Library of Science) 5 (10): e281, doi:10.1371/journal.pbio.0050281, PMID 20076649, PMC: PMC2020498, http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0050281, retrieved on 27 March 2011 
  17. 17.0 17.1 includeonly>Wade, Nicholas. "Research Offers Clue Into How Hearts Can Regenerate in Some Species", New York Times, March 24, 2010. Retrieved on March 29, 2010.
  18. http://www.bhf.org.uk/research/mending-broken-hearts-appeal/the-science.aspx?pid=p&sc_cid=MBH-EX-24&utm_source=MBH-AW&utm_medium=MBH-AW&utm_campaign=MBH-AW-G9_010211&gclid=CL2w_L2hhqcCFcgf4QodBA25eA
  19. Zebra fish may point way to cure for blindness The China Post Friday, August 3, 2007.

Further readingEdit

  • Lambert, Derek J (1997). Freshwater Aquarium Fish, 19, Edison, New Jersey: Chartwell Books.
  • Sharpe, Shirlie. Zebra Danio. Your Guide to Freshwater Aquariums. URL accessed on December 15, 2004.
  • Kocher TD, Jeffery WR, Parichy DM, Peichel CL, Streelman JT, Thorgaard GH (2005). Special feature--roundtable discussion. Fish models for studying adaptive evolution and speciation. Zebrafish 2 (3): 147–56.
  • The Zebrafish Information Network (ZFIN)
  • Bradbury J (2004). Small Fish, Big Science. PLoS Biology 2 (5): 568–72.

External linksEdit

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