<unk>  is a component of some enzymes and stimulates the development and activity of other enzymes.<unk>  superoxide dismutase (MnSOD) is the principal antioxidant in mitochondria. Several enzymes activated by<unk>  contribute to the metabolism of carbohydrates, amino acids, and cholesterol. A deficiency of<unk>  causes skeletal deformation in animals and inhibits the production of collagen in wound healing.
Manganese deficiency 
Zinc toxicity
Zinc deficiency
Biotin deficiency
Chromium deficiency
Copper deficiency
Lead poisoning
Boron deficiency 