Chorionic gonadotropin beta

HCG is a glycoprotein hormone secreted by placental syncytiotrophoblast cells. Its main function is to maintain the corpus luteum and reduce the activity of maternal lymphocytes to prevent rejection of the fetus. The HCG structure includes two subunits α and β. The α subunit is similar to LH, FSH, and TSH, and especially has a large immune cross-reaction with LH. The β chain is unique, and the β subunit is used to make specific Sexual antibodies measure HCG in the blood and are specifically called β-HCG. There are a variety of HCG detection methods, commonly used chemiluminescence, radioimmunoassay (RIA), and immunogold test strip method.

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