Anti-cystatin 9 like antibodies are used for the immunodetection of the protein encoded by the CST9L gene. In humans, the canonical protein has a reported length of 147 amino acid residues and a mass of 17.3 kDa. It is known to be a secreted protein. It is notably expressed in the testis. It is a member of the Cystatin protein family. Post-translational modifications have been described, including glycosylation. Other names for this target antigen include testatin and testicular tissue protein Li 45. ELISA is the most common application for the cystatin 9 like antibodies listed below. Western Blot and Immunohistochemistry are also common applications.