Vitamin A (Retinol) Biochemistry
Vitamin A (retinol) is a group of fat-soluble compounds that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids (notably beta-carotene). Vitamin A is an antioxidant found in leafy green vegetables, and it has a number of functions. Such functions include growth and development, maintenance of the immune system, the formation of visual pigments, and the treatment of measles. Similarly, ATRA (all-trans retinoic acid), another form of vitamin A, is used to treat the APL (acute promyelocytic leukemia) subtype of AML (acute myelogenous leukemia).