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Interested readers are referred to this article and two recent reviews.8 ' Finally I want to stress the statement of Goldberg and Rimington" that whenever an active case of acute intermittent porphyria is discovered it becomes a duty to test the urines of relatives for the presence of porphobilinogen; this test needs to be done with ion exchange chromatography and as far as possible determination of A.L.A. should be included (see ref. 7).-I am, etc., TORBEN K. WITH.

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