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PENK, ID (PENK, Proenkephalin-A, Synenkephalin, Met-enkephalin, Opioid growth factor, PENK(114-133), PENK(143-183), Met-enkephalin-Arg-Gly-Leu, Leu-enkephalin, PENK(237-258), Met-enkephalin-Arg-Phe) (PE) | Gentaur