CUSABIO Technology LLC's CLDN18 Recombinant Monoclonal Antibody monoclonal antibody. The CLDN18 Recombinant Monoclonal Antibody was generated using Claudin 18, and CLDN18 as the antigen. It reacts with Human. This antibody has been shown to work in applications such as: EIA, Immunoassay, ELISA, and Flow Cytometry.