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, the isolation from ox liver of oc-7-hydroxycholesterol was reported. Since that time, a '/3-7-hydroxycholesterol' has been mentioned as isolated from hog liver [MacPhillamy, 1940], and /3-7-hydroxycholesterol has been obtained from pregnant mares' serum [Wintersteiner & Ritzmann, 1940].
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G. A. D. Haslewood (1941) studied this question.
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