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MSH: A metallic element that has the atomic symbol Mg, atomic number 12, and atomic weight 24.31. It is important for the activity of many enzymes, especially those involved in OXIDATIVE PHOSPHORYLATION.,CSP: light, silvery metallic element, symbol Mg, atomic number 12; its salts are essential in nutrition, being required for the activity of many enzymes especially those concerned with oxidative phosphorylation.,NCI: In medicine, a mineral used by the body to help maintain muscles, nerves, and bones. It is also used in energy metabolism and protein synthesis.,NCI: An alkaline earth metal, Magnesium is important for many biochemical functions and reactions; for bone and muscle function, protein and fatty acid formation, activation of B vitamins, blood clotting, insulin secretion, and ATP formation. More than 300 enzymes require magnesium for catalytic action. The adult daily requirement is about 300 mg/day. Magnesium is found in many green plants, vegetables, and seeds; chlorophyll is a magnesium-centered porp
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