PR3 is a reported alias of the human protein 'proteinase 3', encoded by the gene PRTN3. Anti-PR3 antibodies are available from several suppliers. The full protein is reported to be 256 amino acid residues in length. Based on antigen name, there may be porcine, monkey, mouse and rat variants of this protein. See the antibody supplier page for important details, including specific immunogenicity and validated applications.