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Porphyrin is a group of diseases caused by the deficiency of enzymes in heme biosynthesis pathway. Porphyrins or their precursors such as delta-amino-r-ketoxvaleric acid (ALA) and cholinogen (PBG) are produced in abnormally elevated concentrations, accumulate in tissues and are excreted in urine and feces. Clinical manifestations are also called purpura disease, divided into hereditary and acquired two categories, mainly...

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