Skip to main content


  • Recessive inheritance:  see Autosomal Recessive.
  • Red blood cells: cells that carry hemoglobin, for transporting oxygen from the lungs to the rest of the body; erythrocytes.
  • Remission: the state when a disease is no longer active, which does not mean that the disease has not disappeared and has the potential to recur.  Porphyrias are said to be in remission when there are no symptoms.
  • Renal: pertaining to the kidney.
  • Rifampin: an antibiotic used in the treatment of tuberculosis and meningitis.
  • RNA Ribonucleic acid:  is involved in translating the structure of DNA into the structure of protein molecules.