Enkephalin crystals, polarised light micrograph. Enkephalin is an endorphin found in the human brain. There are two variants: Met-enkephalin (seen her
Enkephalin crystals, polarised light micrograph. Enkephalin is an endorphin found in the human brain. There are two variants: Met-enkephalin (seen here), which contains the amino acid methionine, and Leu-enkephalin, which contains the amino acid leucine. Enkephalin is an opioid neurotransmitter (nerve signalling chemical) that has analgesic (painkilling) effects resembling those of the drugs morphine and codeine.
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Photo credit: © DAVID PARKER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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