Anti-H2A clustered histone 20 antibodies are used for the immunodetection of the protein encoded by the H2AC20 gene. In humans, the canonical protein has a reported length of 129 amino acid residues and a mass of 14 kDa. Its subcellular localization is in the nucleus and chromosomes. A member of the Histone H2A protein family, it is an important component of nucleosome. Post-translational modifications have been described, including ubiquitination, acetylation and phosphorylation. Other names for this target antigen include H2A-GL101, H2A/q, H2AFQ, HIST2H2AC, histone H2A type 2-C, H2A histone family, member Q, histone 2, H2ac, and H2A. Gene orthologs have been identified in the mouse, rat and chimpanzee species.