Abstract
A study has been made, using Calliphora stygia at the time of puparium formation, of the incorporation of a number of labelled sterols into β-ecdysone. [1 α- 3H]-Cholesterol and [4- 14C]-cholesterol are incorporated to a similar extent (0·01-0·02%). [1- 3H]-7-Dehydrocholesterol is better incorporated (0·025%) than cholesterol while [1 α- 3H]-cholesterol sulphate, (22R)-22-hydroxy-[22- 3H]-cholesterol, and 25-hydroxy-[26- 14C]-cholesterol are not incorporated to a significant extent.
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