Ready-to-use ELISA kits are available for the detection of I-Abeta, an alias of the protein, major histocompatibility complex, class II, DQ beta 1. The official gene symbol is HLA-DQB1. The protein, with a mass of 30 kDa and length of 261 residues, is reported to be membrane-associated. It is a member of the MHC class II family and may be known by other names, including: HLA-DQB, CELIAC1, MHC class II antigen DQB1, MHC class II HLA-DQ beta glycoprotein, MHC class II DQ beta chain, and HLA class II histocompatibility antigen DQ beta 1 chain.