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Insulin crystals, from NASA's website.
 Credit: NASA/Marshall. This image has been released into the
by the public domain copyright holder, or its copyright has expired. This applies worldwide.
NASA logos (which include the current "meatball" logo, the old "worm" logo, and the seal) is restricted. The NASA website hosts a large number of images from the
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Date/Time Thumbnail Dimensions User Comment
current 15:08, November 7, 2007 320 × 224 (13 KB) PhloxBot ( Talk | contribs) Insulin crystals, from NASA's website. [http://science.nasa.gov/newhome/headlines/msad20sep99_1.htm] Credit: NASA/Marshall.<br />''This image has been released into the ''' public domain''' by the copyright holder, or its copyr