Anti-STAT5A antibodies are used in the immunodetection of the protein signal transducer and activator of transcription 5A. In humans, the canonical protein has a reported length of 794 amino acid residues and a mass of 90.6 kDa. Its subcellular localization is in the nucleus and cytoplasm. Up to 2 different isoforms have been reported for this protein. It is notably expressed in many tissues, such as the lymph node and tonsil. A member of the Transcription factor STAT protein family, STAT5A is known to be involved with cytokine-mediated signaling pathways and the regulation of transcription. Post-translational modifications have been described, including phosphorylation. Synonyms for this target antigen include STAT5, epididymis secretory sperm binding protein, and MGF. STAT5A gene orthologs have been reported in the mouse, bovine and chimpanzee species. Over 1600 citations in the literature describe the use of STAT5a antibodies in research. Western Blot is a widely used application for these antibodies. Immunofluorescence and Immunohistochemistry are also common applications.