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Hydroxylation of steroids at one of the side chain terminal methyl groups, commonly linked to C-26, represents an important regulatory step established in many phyla. Discrimination between the two sites, C-26 and C-27, requires knowing the stereochemistry of the products. 26-Hydroxylation of the insect steroid hormone 20-hydroxyecdysone by a microsomal cytochrome P450 was previously found to be responsible...
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