Anti-Interleukin 4 antibodies are used for the immunodetection of the protein encoded by the IL4 gene. In humans, the canonical protein has a reported length of 153 amino acid residues and a mass of 17.5 kDa. It is known to be a secreted protein. Alternative splicing is reported to yield 2 different isoforms for this protein. A member of the IL-4/IL-13 protein family, it is known to be involved with B cell differentiation and cholesterol metabolism and homeostasis. Post-translational modifications have been described, including glycosylation. The gene encoding this protein is implicated in Ischemic stroke. Other names for this target antigen include BCGF1, BSF-1, BSF1, B cell growth factor 1, B_cell stimulatory factor 1, and BCGF-1. Gene orthologs have been identified in the mouse, rat, bovine, chimpanzee and chicken species. Over 2100 citations in the literature describe the use of Interleukin 4 antibodies in research. ELISA is a widely used application for these antibodies. Flow Cytometry and Western Blot are also common applications.