P16 INK4a is a reported alias of the human protein 'cyclin dependent kinase inhibitor 2A', encoded by the gene CDKN2A. Anti-P16 INK4a antibodies are available from several suppliers. The full protein is reported to be 156 amino acid residues in length. Based on antigen name, there may be canine, monkey, mouse and rat variants of this protein. See the antibody supplier page for important details, including specific immunogenicity and validated applications.