title: Milk, lactase, and gene distribution.
mesh_terms: D000328:Adult; D000818:Animals; D002136:Calcium, Dietary; D002648:Child; D002675:Child, Preschool; D005006:Ethnicity; D005808:Genes, Recessive; D006801:Humans; D007787:Lactose Intolerance / Q000235:genetics*; D008892:Milk / Q000009:adverse effects*; D009626:Terminology as Topic
chemical_list: D002136:Calcium, Dietary