Provided below are ELISA kits targeting endothelin 1, a human protein encoded by EDN1. This protein is 212 amino acids long, with a mass of 24.4 kDa, and is a member of the Endothelin/sarafotoxin family. This is reported to be a secreted protein. There is a noted implication in Question mark ears, isolated. Other alias names for this protein include: preproendothelin-1, ARCND3, ET1, HDLCQ7, and ARCND3. ELISA kits are available that are reactive to human, mouse, rat, bovine, chicken, primate, guinea pig, fish, plant, and other mammalian variants of the target antigen.