Retinol - Vitamin A, Elmer McCollum, Lafayette Mendel, Chromophore, Rhodopsin, Visual phototransduction, Glycoprotein, Tretinoin, Isotretinoin, Vitamin A deficiency, Retinol binding protein, Nyctalopia, Hypervitaminosis A, Retinyl palmitate, Retinol dehydrogenase, Retinol isomerase, Retinol binding protein 4, Retinal, RBP3, Retinoid, Lipocalin