title: Three serum enzymes in twins.
mesh_terms: D000293:Adolescent; D000328:Adult; D000469:Alkaline Phosphatase / Q000097:blood*; D004156:Catechol Oxidase / Q000097:blood; D002570:Ceruloplasmin / Q000032:analysis*; D002648:Child; D002802:Cholinesterases / Q000097:blood*; D005260:Female; D006801:Humans; D011247:Pregnancy; D014427:Twins
chemical_list: D004156:Catechol Oxidase; D002570:Ceruloplasmin; D002802:Cholinesterases; D000469:Alkaline Phosphatase