Adrenomedullin (AM) (1-12), human (C64H100N22O19S1), is a peptide with the sequence Tyr-Arg-Gln-Ser-Met-Asn-Asn-Phe-Gln-Gly-Leu-Arg. It was first discovered to be associated with pheochromocytoma, a tumor arising from adrenal medulla, in 1993.