Provided below are ELISA kits targeting alpha-2-macroglobulin like 1, a human protein encoded by A2ML1. This protein is 1454 amino acids long, with a mass of 161.1 kDa, and is a member of the Protease inhibitor I39 (alpha-2-macroglobulin) family. 2 isoforms have been identified. This is reported to be a secreted protein. There is a noted implication in Otitis media. Other alias names for this protein include: alpha-2-macroglobulin-like protein 1, C3 and PZP-like alpha-2-macroglobulin domain containing 9, CPAMD9, OMS.