Listed are ELISA Kits for the detection of p16INK4a, an alias name of cyclin dependent kinase inhibitor 2A. The human protein, encoded by the gene CDKN2A, is 156 amino acid residues long and has a mass of 16,533 daltons. However, there are up to 6 reported isoforms. It is a member of the CDKN2 cyclin-dependent kinase inhibitor family. This protein is reported to have a cytoplasmic and nuclear cellular localization. This target may also be known as: CDK4 inhibitor p16-INK4, alternative reading frame, cell cycle negative regulator beta, cyclin-dependent kinase 4 inhibitor A, multiple tumor suppressor 1, ARF, and CDK4I.