Provided below are ELISA kits targeting kallikrein B1, a human protein encoded by KLKB1. This protein is 638 amino acids long, with a mass of 71.4 kDa, and is a member of the Peptidase S1 family, Plasma kallikrein subfamily. This is reported to be a secreted protein. There is a noted implication in Prekallikrein deficiency. Other alias names for this protein include: plasma kallikrein, kallikrein B plasma (Fletcher factor) 1, kininogenin, plasma prekallikrein, PKKD, and PPK. ELISA kits are available that are reactive to human, mouse, rat, and bovine variants of the target antigen.