title: Letter: Biosynthesis of uroporphyrinogen III from porphobilinogen. Resolution of the enigmatic "switch" mechanism.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D011163:Hydroxymethylbilane Synthase / Q000378:metabolism; D008722:Methods; D011162:Porphobilinogen; D011165:Porphyrinogens / Q000096:biosynthesis*; D014576:Uroporphyrinogen III Synthetase / Q000378:metabolism; D014577:Uroporphyrinogens / Q000096:biosynthesis*
chemical_list: D011165:Porphyrinogens; D014577:Uroporphyrinogens; D011162:Porphobilinogen; D011163:Hydroxymethylbilane Synthase; D014576:Uroporphyrinogen III Synthetase