Anti-Sin3A antibodies are used in the immunodetection of the protein SIN3 transcription regulator family member A. In humans, the canonical protein has a reported length of 1273 amino acid residues and a mass of 145.2 kDa. Its subcellular localization is in the nucleus. It is reported to be expressed in the developing brain, with highest levels of expression detected in the ventricular zone of various cortical regions. SIN3A is known to act as a transcriptional repressor. Post-translational modifications have been described, including sumoylation. Synonyms for this target antigen include DEL15Q24, WITKOS, paired amphipathic helix protein Sin3a, SIN3 homolog A, transcription regulator, and CHR15DELq24.