HCG beta (beta-Human Chorionic Gonadotropin), also termed as Chorionic Gonadotropin, Beta Chain (CGB).It is encoded by a multigene cluster composed of six homologous sequences. And in the family of beta-containing glycoprotein hormones, β-HCG is unique in that it contains an extension of 29 amino acids at its COOH end. HCG beta is mapped to 19q13.32 and expressed in trophoblast and various malignant tumors promotes cellular motility in vivo. Beta-HCG has a novel function in uterine adaptation to early pregnancy as well as in tumor development and underline the importance of HCG as an as yet unrecognized angiogenic factor.Synonyms: CGB, CGB3, Choriogonadotropin subunit beta, beta hCG, hCG-beta