Anti-H2A clustered histone 18 antibodies are used for the immunodetection of the protein encoded by the H2AC18 gene. Other names for this target antigen include H2A.2, H2A/O, H2A/q, H2AC19, H2AFO, H2a-615, HIST2H2AA, and H2A. Gene orthologs have been identified in the rat species.