From adam: "porphyrias are a group of rare disorders passed down through families, in which an important part of hemoglobin, called heme, is not made properly.
Heme is also found in myoglobin
, a protein
found in certain muscles... Patients with porphyria
have a deficiency of certain enzymes needed for this process. Porphyrias involve 3 major symptoms: abdominal pain
, rashes, and neurologic symptom.