Ready-to-use ELISA kits are available for the detection of retinoic acid receptor, beta, an alias of the protein, retinoic acid receptor beta. The official gene symbol is RARB. The protein, with a mass of 50.5 kDa and length of 455 residues, is reported to be cytoplasmic and nuclear. It is a member of the Nuclear hormone receptor family, NR1 subfamily and may be known by other names, including: HAP, retinoic acid receptor beta polypeptide, hepatitis B virus activated protein, RAR-epsilon, RAR-beta, and HBV-activated protein, and NR1B2.