Prodynorphin's a opioid polypeptide hormone involved with chemical signal transduction and cell communication. The gene for prodynorphin's expressed in the endometrium and the striatum, and its gene map locus's 20pter-p12. Prodynorphin's a basic building block of endorphins, the chemical messengers in the brain that appear most heavily involved in the anticipation and experience of pain and the formation of deep emotional bonds, and which are also critical in learning and memory. The gene's tho… (More on Prodynorphin)