These Epithelial Stromal Interaction 1 (breast) ELISA kits are immunodetection tools for measuring specific protein levels in biological samples. Epithelial Stromal Interaction 1 (breast) is an alias of the human EPSTI1 gene, which encodes the protein, epithelial stromal interaction 1. The protein is reported to play a role in in M1 macrophage polarization and is required for the proper regulation of gene expression during M1 versus M2 macrophage differentiation (By similarity). The EPSTI1 protein is 318 amino acid residues in length and 36.8 kilodaltons in mass. However, as many as 3 protein isoforms have been identified. In terms of tissue specificity, it is reported to be highly expressed in placenta, small intestine, spleen, kidney, thymus, liver, salivary gland and testes. Other names for this target antigen include epithelial-stromal interaction protein 1 and epithelial stromal interaction 1 (breast). Click on the following ELISA kits for more detailed information, including target reactivity and assay sensitivity.