Utilizing specific radioimmunoassay and gel chromatographic separation methods, the concentration of a glycoprotein hormone subunit and the beta subunit of hCG, hLH, and hFSH was determined. The alpha glycoprotein hormone subunit is present throughout gestation in the serum and pituitary of the human fetus; little or no subunit is apparent in contrast to that of intact LH and FSH.
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Kaplan et al. (1976) studied this question.