Unsaponifiable constituents of kidney in various species

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Abstract
SA and SC (2 spectrosco-pically recognizable compounds of unknown composition) are normal constituents of unsaponfiable fraction of kidneys from 11 different species. Kidney tissue contained only a few International Units of vitamin A/g, but the results with cats were quite unusual. Cat kidneys contained an average of approximately 100 International Units of the vitamin/g. Vitamin E was detected in cat, dog and sheep kidney; the concentration in cat kidney being much greater than in the other 2 species. Vitamins A and E in cat kidney were found predominantly in the cortex. Vitamin E was not detected in the medulla.