abnormal beta-galactosidase level absent beta-galactosidase protein absent beta-D-lactosidase protein absent S 2107 protein absent lactozym protein absent beta-gal protein absent oryzatym protein absent sumiklat protein absent lactose hydrolysis protein absent beta-lactosidase protein absent beta-D-galactoside galactohydrolase protein absent hydrolact protein undetectable levels of the hydrolase enzyme that catalyzes the hydrolysis of beta-galactosides into monosaccharides MP:0020260 absent maxilact protein absent trilactase protein absent exo-(1->4)-beta-D-galactanase protein absent beta-D-galactanase protein