A PstI polymorphism for the human porphobilinogen deaminase gene (PBG).
D000642:Ammonia-Lyases / Q000235:genetics*; D006801:Humans; D011163:Hydroxymethylbilane Synthase / Q000235:genetics*; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length
D011163:Hydroxymethylbilane Synthase; D000642:Ammonia-Lyases