Steven O. Schwartz

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ECENT STUDIES” 2, 3 have emphasized that in human beings, photosensitivity occurs as a result of two fundamentally different disturbances of porphyrin metabolism. In porphyria cutanea tarda, in which the excessive porphyrin formation is believed to take place in the liver, symptoms are seldom manifest before adult life.’ Its porphyria erythropoietica(More)