Anti-HEXIM P-TEFb complex subunit 2 antibodies are used for the immunodetection of the protein encoded by the HEXIM2 gene. In humans, the canonical protein has a reported length of 286 amino acid residues and a mass of 32.4 kDa. Its subcellular localization is in the nucleus. It is widely expressed across many tissue types. A member of the HEXIM protein family, it is a reported transcriptional regulator which functions as a general RNA polymerase II transcription inhibitor. Other names for this target antigen include MAQ1 paralog, hexamethylene bis-acetamide inducible 2, hexamethylene bis-acetamide-inducible protein 2, hexamethylene bisacetamide inducible 2, and protein HEXIM2. Gene orthologs have been identified in the mouse, rat, bovine and chimpanzee species.