Nikolas
Created page with "<section begin="clinical biochemistry" />'''Porphyrias''' are genetic diseases where there are defects in one of the enzymes required for porphyria synthesis. Porphyrins are circular molecules which consist of four porphobilinogen molecules. Many proteins contain porphyrins, including haemoglobin, myoglobin, cytochromes, and NO-activated guanylyl cyclase. Porphyrias are rare disorders, but the prevalence varies significantly with geography. Fo..."
