Peptide for the determination of human parathyroid hormone

PEPTIDE of the formula: (CF DRAWING IN BOPI) wherein R is H, H-Tyr-A GROUP OR GROUP R-PRO-Arg, R is H, GROUP H-Tyr-OR R-ALA-GLY-SER-GLN-Arg, R REPRESENTS AND H, H-Cys A GROUP OR GROUP H-Tyr, and its salts.