Anti-H2AC20 antibodies are used in the immunodetection of the protein H2A clustered histone 20. 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. It is notably widely expressed in many tissue types. A member of the Histone H2A protein family, H2AC20 is an important component of nucleosome. Post-translational modifications have been described, including ubiquitination, acetylation and phosphorylation. Synonyms 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. H2AC20 gene orthologs have been reported in the mouse, rat and chimpanzee species.