Vitamin D3. Molecular model of cholecalciferol,also known as vitamin D3 and toxiferol. This vitamin (actually a prehormone) can be synthesized in the body when sun exposure is adequate. The active form,calcitriol,regulates the synthesis of hundreds of enzymes. Atoms are represented as spheres and are colour-coded: carbon (grey),hydrogen (white) and oxygen (red) | |
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