Ready-to-use ELISA kits are available for the detection of Placental Lactogen, an alias of the protein, chorionic somatomammotropin hormone 1. The official gene symbol is CSH1. The kits can detect several species variants of the protein, including: human, mouse, rat, bovine, primate, guinea pig, and other mammalian. The protein, with a mass of 25 kDa and length of 217 residues, is reported to be secreted. It is a member of the Somatotropin/prolactin family and may be known by other names, including: CSA, CS-1, growth hormone B3, chorionic somatomammotropin-1, chorionic somatomammotropin A, and choriomammotropin, and GHB3.