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If we introduce iron complexly into ooporphyrin, we obtain haemin.
In cases of porphyria, a minor disease, the patient excretes large quantities of porphyrins.
The blood pigment haemoglobin is a compound which can be split by diverse methods into its constituents, pigment and protein.
Coproporphyrin in particular is widespread; traces are present in normal urine and also in yeast. In special cultures, yeast can be made to produce considerable quantities of coproporphyrin.