• Ghrelin is a 28 amino-acid lipophilic peptide with a labile octanoic acid side chain at the serine residue three, that is primarily expressed in specialized enterochromaffin cells located mainly i...Company:Diagnostic Systems Laboratories, Inc.PYY, Total ELISA TestDescription:... peptide YY (PYY) was first identified in 1980 (1) and has ..., the N-terminal truncated form of the full length peptide