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It is shown that the insect Tenebrio molitor is able to convert the (24R,28S)-isofucosterol epoxide into cholesterol much better than the (24S,28R)-isomer; on the other hand, the (24R,28R)- and the (24S,28S)-fucosterol epoxides are transformed into cholesterol at about the same extent.
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Nicotra et al. (1981) studied this question.
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