Chitinases are ubiquitous chitin-fragmenting hydrolases, however until a few years ago that chitinase like proteins have been found in mammalian.

• 几丁质酶是自然界广泛存在的一类降解几丁质的水解酶类；但是直至近些年才在哺乳动物体内发现存在有几丁质酶样蛋白.