<unk>  <unk>  is a rare metabolic disorder in the production of heme, the oxygen-binding prosthetic group of hemoglobin.  Specifically, it is characterized by a deficiency of the enzyme porphobilinogen deaminase (PBGD) or hydroxymethylbilane synthase (HMBS)
Acute intermittent porphyria
Porphyria
Woodhouse-Sakati syndrome
Amnesic shellfish poisoning
Waterhouse–Friderichsen syndrome
Hashimoto's encephalopathy
Traveler's diarrhea
Coastal leucothoe poisoning