Anti-WAP4 antibodies enable researchers to detect and measure the WAP4 antigen in biological samples. This target is a reported synonym of the SLPI gene, which encodes secretory leukocyte peptidase inhibitor. This protein is known to function in immune response pathways and innate immune responses, among other biological roles. The human version of WAP4 has a canonical amino acid length of 132 residues and a protein mass of 14.3 kilodaltons. It is reported to be a secreted protein that is notably expressed in the nasopharynx, kidney, fallopian tube, cervix, and bronchus. Other names for this target antigen include ALK1, ALP, and BLPI. Western Blot is the most common application for the WAP4 antibodies listed below. ELISA and Immunohistochemistry are also common applications.