Abstract
Amniotic fluid porphyrins, biosynthesis of porphyrins by amniotic cells, and uroporphyrinogen III cosynthetase were studied after the 17th week of a pregnancy at risk for congenital erythropoietic porphyria (CEP). Only coproporphyrin was found in amniotic fluid. A diagnosis of CEP was ruled out by the demonstration of normal cosynthetase activity; biosynthesis of porphyrins was identical, not only in the porpositus and in control amniotic cells, but also in patients with CEP and in control skin fibroblasts.
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