Anti-IL 9 antibodies enable researchers to detect and measure the IL 9 antigen in biological samples. This target is a reported synonym of the IL9 gene, which encodes interleukin 9. This protein is known to function in B cell differentiation and inflammatory response pathways, among other biological roles. The human version of IL 9 has a canonical amino acid length of 144 residues and a protein mass of 15.9 kilodaltons. It is reported to be a secreted protein. Other names for this target antigen include HP40, P40, and T-cell growth factor p40. Western Blot is the most common application for the IL 9 antibodies listed below. ELISA and Immunohistochemistry are also common applications.