title: Lactose and lactase--a historical perspective.
mesh_terms: D000349:Africa; D000818:Animals; D044383:Black People; D010872:Caniformia; D004285:Dogs; D005006:Ethnicity; D005696:Galactosidases / Q000378:metabolism*; D006168:Guinea Pigs; D006801:Humans; D007421:Intestine, Small / Q000201:enzymology; D007785:Lactose / Q000378:metabolism*; D007787:Lactose Intolerance / Q000201:enzymology / Q000378:metabolism; D051379:Mice; D008895:Milk, Human; D009549:Nigeria; D011817:Rabbits; D051381:Rats; D014481:United States; D001741:Black or African American
chemical_list: D005696:Galactosidases; D007785:Lactose