ID 3.2.1.108 DE lactase. CA H2O + lactose = beta-D-galactose + D-glucose. CC -!- The enzyme from intestinal mucosa contains two glycosyl hydrolase CC domains, both of which belong to glycosyl hydrolase family 1 (GH1). CC -!- While the first domain catalyzes the activity described here, CC the second domain catalyzes the reaction of EC 3.2.1.62. cf. CC EC 3.2.1.33. DR P09848, LPH_HUMAN ; P09849, LPH_RABIT ; Q02401, LPH_RAT ; DR W5PLZ6, LPH_SHEEP ; //