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Abstract
In a paper presented at the IV International Congress of Biochemistry (Eriksen, 1958 a) evidence was presented indicating that at least 3 different coproporphyrins, chromatographically behaving like the II, III (1V) and I isomers of coproporphyrin, were present in the urine of normal man and rabbit. The main isomer found in both man and rabbit was the 111 isomer, smaller amounts of the I isomer and trace amounts of a coproporphyrin behaving as the II isomer.