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Large quantities of 3-hydroxy-kynurenine (3-OHK) are accumulated in dilatations of the endoplasmic reticulum in the renal tubules of Drosophila melanogaster. In the tubules of the mutant „red“, this stored 3-OHK is converted into ommochromes, of which a small quantity is xanthommatin and a larger quantity is ommin; both of these stain the tubules red. The identification of these substances was confirmed by comparison with authentic compounds (figs. 1 — 3).

Natur und Bildung des roten Farbstoffes in den Nierentubuli der Mutante “red“ von Drosophila melanogaster