title: The effect of  -carotene on serum vitamin A levels in erythropoietic protoporphyria.
mesh_terms: D000328:Adult; D002338:Carotenoids / Q000097:blood / Q000627:therapeutic use*; D002648:Child; D004920:Erythropoiesis; D005260:Female; D006801:Humans; D008297:Male; D011164:Porphyrias / Q000097:blood / Q000188:drug therapy*; D014801:Vitamin A / Q000097:blood*
chemical_list: D014801:Vitamin A; D002338:Carotenoids