Ready-to-use ELISA kits are available for the detection of activin receptor IIB, an alias of the protein, activin A receptor type 2B. The official gene symbol is ACVR2B. The kits can detect several species variants of the protein, including: mouse and rat. The protein, with a mass of 57.7 kDa and length of 512 residues, is reported to be membrane-associated. It is a member of the Protein kinase superfamily, TKL Ser/Thr protein kinase family, TGFB receptor subfamily and may be known by other names, including: ActR-IIB, ACTRIIB, activin A receptor type IIB, and activin receptor type-2B.