CGB1 is a symbol for the gene, Chorionic gonadotropin, beta polypeptide 1, in humans. Other names include: Choriogonadotropin subunit beta variant 1. The encoded protein has an amino acid length of 187 and a mass of 20.5 kDa. Other isoforms may exist. CGB1 is a member of the Glycoprotein hormones subunit beta family.