This leaves the acidic lipases less efficient than alkaline lipases. Lipase inhibitors are substances used to reduce the activity of lipases found in the intestine. The reaction can also be accomplished with the help of enzymes (biocatalysts) particularly lipases (E.C.3.1.1.3). These include hydrolases such as&colon; lipases, esterases, and cutinases. These can include&colon; surface adhesins, mannans, enzymes such as proteinases, peptidases, DNases, and lipases. Zymography can also be applied to other types of enzymes, including xylanases, lipases and chitinases. Lipase inhibitors covalently bond to the active serine site on lipases. Leeches are unusual in that they do not produce amylases, lipases or endopeptidases. Genes encoding lipases are even present in certain viruses. The best characterized are the RTX toxins and the lipases. Gastric lipase, together with lingual lipase, comprise the two acidic lipases. Lingual lipase, together with gastric lipase, comprise the two acidic lipases. Examples of virulence factors for "Staphylococcus aureus" are hyaluronidase, protease, coagulase, lipases, deoxyribonucleases and enterotoxins. Triglyceride lipases () are a family of lipolytic enzymes that hydrolyse ester linkages of triglycerides. Some common examples of hydrolase enzymes are esterases including lipases, phosphatases, glycosidases, peptidases, and nucleosidases.