ALAD Porphyria (ADP)
This form of Porphyria is inherited as an autosomal recessive trait and seems to be extremely rare. The symptoms are very similar to Acute Intermittent Porphyria. There is a deficiency of the enzyme delta-aminolevulinic acid dehydratase (ALAD) and increased excretion of delta-aminolevulinic acid (ALA) in the urine.
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