These enzymes include peptidase, sucrase, maltase, lactase and intestinal lipase. Vampire bats are the only vertebrates known to not exhibit intestinal maltase activity. Other examples include lactase, amylase, chitinase, sucrase, maltase, neuraminidase, invertase, hyaluronidase and lysozyme. Maltase, a similar enzyme that cleaves maltose, is nearly functionally equivalent. Maltase breaks maltose into two units of either glucose or fructose. Additional digestive enzymes produced by these glands include dipeptidases, maltase, sucrase, lactase, and enterokinase. Furthermore, for the cleavage of disaccharides, there are maltase, lactase, sucrase, trehalase and others. Maltase catalyzes the hydrolysis of maltose to the simple sugar glucose.