Opiod Create Talk0 Category page This page needs content. You can help by adding a sentence or a photo! Add to this page! “Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual... Opioid peptide Pages in category "Opiod" This category contains only the following page. O Opioid peptide Retrieved from "http://psychology.wikia.com/wiki/Category:Opiod"