Provided below are ELISA kits targeting thymosin beta 4 X-linked, a human protein encoded by TMSB4X. This protein is 44 amino acids long, with a mass of 5.1 kDa, and is a member of the Thymosin beta family. This is reported to be a cytoplasmic protein. Other alias names for this protein include: thymosin beta-4, prothymosin beta-4, t beta-4, thymosin beta 4 X chromosome, PTMB4, TB4X, and TMSB4. ELISA kits are available that are reactive to rat variants of the target antigen.