NS3 is a reported alias of the human protein 'KRAS proto-oncogene, GTPase', encoded by the gene KRAS. Anti-NS3 antibodies are available from several suppliers. The full protein is reported to be 189 amino acid residues in length. Based on antigen name, there may be canine, porcine, monkey, mouse and rat variants of this protein. The NS3 antigen is a documented cancer marker. See the antibody supplier page for important details, including specific immunogenicity and validated applications.