title: Idiopathic presenile and senile cataract formation and changes in lactase activity.
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001944:Breath Tests; D002386:Cataract / Q000201:enzymology*; D005260:Female; D005696:Galactosidases / Q000378:metabolism*; D006801:Humans; D007785:Lactose / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D001616:beta-Galactosidase / Q000378:metabolism*
chemical_list: D005696:Galactosidases; D001616:beta-Galactosidase; D007785:Lactose