[Contiguous with the LH beta subunit gene on chromosome 19q13.3, six homologous genes arranged in tandem and inverted pairs encode the beta subunit of Chorionic Gonadotropin (Glycoprotein Hormone Beta Family).Glycoprotein hormones are heterodimers of a common alpha subunit and a unique beta subunit that confers biological specificity. Produced by placental trophoblasts, Chorionic Gonadotropin stimulates ovarian steroid synthesis essential for maintenance of pregnancy. (NCI) ( NCI )] (UMLS (NCI) C0106132) =Amino Acid, Peptide, or Protein; Hormone