NCIt definition : Proenkephalin-A (267 aa, 31 kDa) is encoded by the human PENK gene. This protein
is involved in opioid receptor signaling.;
NCIt note : Proenkephalin-A is cleaved into at least 8 potentially active peptides: Synenkephalin,
Met-enkephalin, PENK(114-133), PENK(143-183), Met-enkephalin-Arg-Gly-Leu, Leu-enkephalin,
PENK(237-258), and Met-enkephalin-Arg-Phe. (UniProt);