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HCG is a dimeric glycoprotein with a molecular weight of 37,000
Dalton consisting of an and a β -subunit. The subunit of HCG
is nearly identical with the analogous subunit of the pituitary
hormones LH, FSH, and TSH.
HCG is produced by the syncytiotrophoblast of the placenta and
can be detected in maternal serum immediately upon nidation.