H-Leu-Trp-Leu-OH is a tryptophan protease that has been shown to have aminopeptidase activity. It can be used in the treatment of intestinal inflammation, as well as other conditions where it is desirable to reduce the concentration of amino acid precursors. The oxidation products of H-Leu-Trp-Leu-OH are antigenic and can be used for the detection of this enzyme in biological fluids. Hplc analysis can identify tripeptides formed by H-Leu-Trp-Leu-OH, which are then cleaved by other enzymes. This process creates a radioactive product that can be detected using radiation or microscopy. Immunoaffinity chromatography is also able to isolate H-Leu-Trp-Leu-OH from biological fluids. Monoclonal antibodies against this enzyme have been shown to inhibit ectoenzymes such as lipases and phospholip