title: Competition between retinol and 3,4-didehydroretinol for esterification in crude pigment epithelial cell fractions.
abstract: The membrane fraction of the retinal pigment epithelium (RPE) of the frog (Rana pipiens) catalyzed the esterification of tritiated retinol to retinyl esters. This esterification reaction was inhibited in the presence of 3,4-didehydroretinol.
mesh_terms: D000818:Animals; D004224:Diterpenes; D004951:Esterification; D066298:In Vitro Techniques; D010857:Pigment Epithelium of Eye / Q000201:enzymology / Q000378:metabolism*; D011894:Rana pipiens; D000084562:Retinyl Esters; D014801:Vitamin A / Q000031:analogs & derivatives* / Q000378:metabolism*
chemical_list: D004224:Diterpenes; D000084562:Retinyl Esters; C024366:vitamin A2; D014801:Vitamin A; C014794:retinol palmitate