Intrinsic bioactivity of thyrotropin in human serum is inversely correlated with thyroid hormone concentrations. Application of a new bioassay using the FRTL-5 rat thyroid cell strain.

Intrinsic bioactivity of thyrotropin in human serum is inversely correlated with thyroid hormone concentrations. Application of a new bioassay using the FRTL-5 rat thyroid cell strain.