There are a number of ELISA Kits available for the measurement of IAalpha, another term for the human protein, major histocompatibility complex, class II, DQ alpha 1. Other synonyms may include: HLA class II histocompatibility antigen DQ alpha 1 chain, DC-1 alpha chain, MHC HLA-DQ alpha, MHC class II DQA1, MHC class II antigen DQA1, DQ-A1, and DQA1. It is encoded by the HLA-DQA1 gene to yield a protein 254 amino acids in length and 27.8 kDa in size. The protein is categorized into the MHC class II family. Versions of IAalpha are present in other organisms, including: Mouse, Rat, Frog.