[Heterogeneity of human plasma parathormone]

The heterogeneity in the plasma of peptide hormones has been known for some time. The demonstration of various fragments of circulating parathormone was undertaken using two antisera, which permitted the authors to study: -- the plasma half-life of parathormone; -- the variations in parathormone levels during dynamic tests; -- the limits between normal and pathological levels. It was thus demonstrated that the antisera recognised, in one case, the terminal carboxyl fragment, in the other case, the terminal amino fragment.