2. Porphyrias
Under normal circumstances, when heme concentrations are at an appropriate level, precursor production decreases. However, a glitch in the biosynthesis pathway—represented by a defective enzyme—means that heme biosynthesis does not reach completio...
Healthline.com (OMS Preferred Provider)

3. Porphyria, Variegate
Mixed Hepatic Porphyria; Porphyria Cutanea Tarda Hereditaria; Porphyria Hepatica, Variegate; South African Genetic Porphyria;
Healthline.com (OMS Preferred Provider)

4. Porphyria: MedlinePlus
Porphyrias are a group of genetic disorders caused by problems with how your body makes a substance called heme. Heme is found throughout the body, especially in your blood and bone marrow, where it carries oxygen.
MedlinePlus (Offsite)

5. Porphyria - Genetics Home Reference
Porphyria is a group of disorders caused by abnormalities in the chemical steps that lead to heme production. Heme is a vital molecule for all of the body's organs, although it is most abundant in the blood, bone marrow, and liver. Heme is a compo...
MedlinePlus (Offsite)

6. Porphyria - References - Genetics Home Reference
Anderson KE, Bloomer JR, Bonkovsky HL, Kushner JP, Pierach CA, Pimstone NR, Desnick RJ. Recommendations for the diagnosis and treatment of the acute porphyrias. Ann Intern Med. 2005 Mar 15;142(6):439-50. Review.
MedlinePlus (Offsite)

7. Porphyria : Search Results - healthfinder.gov - Your Source for Reliable Health Information
This mini-fact sheet contains basic consumer health information about this inherited disorder that is characterized by the body's over-production of the in chemical porphyrin.... Details >
HealthFinder.gov

8. Porphyria
Porphyria is a term that refers to a group of disorders—the porphyrias—that affect the nervous system or skin, or both. Each type of porphyria is due to the deficiency of one of the enzymes needed to make a substance in the body called heme....
digestive.niddk.nih.gov

9. Porphyria
The porphyrias are a group of uncommon diseases that cause either disease affecting the skin, disease affecting the nervous system, or both.
labtestsonline.org.uk

10. Porphyria
The term porphyria refers to a group of disorders. They do differ in some ways, but all share the same problem. They all have a build up of porphyrins in the body. Porphyrins help to make heme a part of the red blood cell. However, a build up of t...
www.mbhs.org