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“In vertebrates, both nuclear all-trans and 9-cis retinoic acid receptors (RAR and RXR) belonging to the steroid/thyroid/retinoid nuclear receptor superfamily play a crucial role in the vitamin A action.”
“Since all-trans-retinol is a precursor of cis-retinols, its inhibitory effect on the activity suggests that it could play an important role in modulating the formation of 9-cis-retinoic acid.”
“A metabolite of retinol with characteristic ultraviolet absorption maxima for 9-cis retinol was observed in these 2 adipose depots, and its level was 2-fold higher in Sc than in Vis tissues.”