Anti-EPSTI1 antibodies are used in the immunodetection of the protein epithelial stromal interaction 1. In humans, the canonical protein has a reported length of 318 amino acid residues and a mass of 36.8 kDa. Up to 3 different isoforms have been reported for this protein. It is reported to be highly expressed in the placenta, small intestine, spleen, kidney, thymus, liver, salivary gland and testes. EPSTI1 is reported to play a role in M1 macrophage polarization and is required for the proper regulation of gene expression during M1 versus M2 macrophage differentiation (By similarity). Synonyms for this target antigen include epithelial-stromal interaction protein 1 and epithelial stromal interaction 1 (breast). EPSTI1 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. Some EPSTI1 antibodies may have been used in research and have associated citations. Western Blot is a widely used application for these antibodies. ELISA and Immunohistochemistry are also common applications.