Anti-HTATSF1 antibodies are used in the immunodetection of the protein HIV-1 Tat specific factor 1. In humans, the canonical protein has a reported length of 755 amino acid residues and a mass of 85.9 kDa. Its subcellular localization is in the nucleus. It is widely expressed across many tissue types. A member of the HTATSF1 protein family, HTATSF1 is known to function as a general transcription factor playing a role in the process of transcriptional elongation. Synonyms for this target antigen include TATSF1, dJ196E23.2, HIV Tat-specific factor 1, HIV TAT specific factor 1, cofactor required for Tat activation of HIV-1 transcription, and TAT-SF1. HTATSF1 gene orthologs have been reported in the mouse, rat, frog, zebrafish, chimpanzee and chicken species. Some HTATSF1 antibodies may have been used in research and have associated citations. Western Blot is a widely used application for these antibodies. Immunofluorescence and Immunohistochemistry are also common applications.