Vitamin amino acids. Most vitamins are not single molecules, but groups of related molecules called vitamers. For example, vitamin E consists of four tocopherols and four tocotrienols. The thirteen vitamins required by human metabolism are: vitamin A (retinols and carotenoids), vitamin B (thiamine), vitamin B (riboflavin), vitamin B (niacin), vitamin B (pantothenic acid), vitamin B (pyridoxine), vitamin B (biotin), vitamin B (folic acid or folate), vitamin B (cobalamins), vitamin C (ascorbic acid), vitamin D (calciferols), vitamin E (tocopherols and tocotrienols), and vitamin K (quinones). Vitamins have diverse biochemical functions. Some forms of vitamin A function as regulators of cell and tissue
Kawasaki GPZ1100 B1/B2 models. The frames are basically the same with a few subtle differences in the fasteners used. The tail light of the B2 features a reflector on each side of the rear lens. The internals of the lens are also different between the two models. The tail light lens feature identical mounting, so they can be interchanged. The B1 was only released in 1981 and the B2 in 1982, after that, the dual shock 1100 models ended and the monoshock GPz1100(ZX1100-A1) were released. Kawasaki GPZ1100 B1/B2 The Kawasaki GPz1100 B1 and B2 are motorcycles that were manufactured by Kawasaki in 1981