title: Letter: Nomenclature of erythropoietic protoporphyria.
mesh_terms: D002250:Carbon Radioisotopes; D004912:Erythrocytes / Q000032:analysis*; D005243:Feces / Q000032:analysis; D005998:Glycine / Q000378:metabolism; D006801:Humans; D007982:Levulinic Acids / Q000378:metabolism; D008099:Liver / Q000032:analysis / Q000378:metabolism; D009587:Nitrogen Isotopes; D011164:Porphyrias; D011166:Porphyrins / Q000032:analysis / Q000096:biosynthesis; D011868:Radioisotopes; D009626:Terminology as Topic; D014316:Tritium; D014557:Urobilin / Q000032:analysis
chemical_list: D002250:Carbon Radioisotopes; D007982:Levulinic Acids; D009587:Nitrogen Isotopes; D011166:Porphyrins; D011868:Radioisotopes; D014316:Tritium; D014557:Urobilin; D005998:Glycine