Abstract

SUMMARY Antisera were raised to human chorionic gonadotrophin (HCG) and human menopausal gonadotrophin (HMG). Normal human serum and human pituitary and chorionic gonadotrophins reacted with both antisera in immunological experiments. After absorption with human serum, the γ-globulin fractions of the antisera were isolated, and only the reaction to the hormone preparations remained. Immunoelectrophoresis revealed a common antigenic factor in the α2-β globulin region. The γ-globulin fraction of HCG antiserum seems to be suitable for the assay of HCG, while that of the HMG antiserum might be employed for the detection of HMG.

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