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The progesterone 17α-hydroxylase activity, which is one of the steroidogenic enzymes in rat testis microsomes, was significantly inhibited by crude marijuana extracts from Δ 9 -tetrahydrocannabinolic acid (THCA)- and cannabidiolic acid (CBDA)-strains. Δ 9 -Tetrahydrocannabinol, cannabidiol and cannabinol also inhibited the enzymatic activitiy with relatively higher concentration (100–1000μM)...
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