An attempt was made to quantify the number of specific estrogen binding sites in specimens of human goitrous or neoplastic thyroid tissue obtained by surgery. Using synthetic estrogen [3H]moxestrol as a radioligand, the concentrations of estrogen receptors found were very low (average 0.57 +/- 0.47 fmol mg-1 of protein) approaching the detection limit. Accordingly, no significant sex dependent differences in estrogen receptors could be revealed.
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