Provided below are ELISA kits targeting mesothelin, a human protein encoded by MSLN. This protein is 630 amino acids long, with a mass of 69 kDa, and is a member of the Mesothelin family. 4 isoforms have been identified. This is reported to be a membrane and secreted protein. Glycosylation sites have been reported. Other alias names for this protein include: CAK1 antigen, megakaryocyte potentiating factor, pre-pro-megakaryocyte-potentiating factor, soluble MPF mesothelin related protein, and megakaryocyte potentiating factor. ELISA kits are available that are reactive to human, mouse, rat, bovine, chicken, primate, guinea pig, fish, and other mammalian variants of the target antigen.