For 10 points, name this vitamin that can be obtained through drinking milk or being exposed to sunlight.
This vitamin promotes cathelicidin production. A polymorphism of the gene coding for this vitamin's binding protein is associated with Graves' disease, and this vitamin's receptors are highly expressed in activated T and B cells. It amplifies natural killer cell activity, and overconsumption of it can cause hypertension and kidney stones. The liver converts it to calcidiol, which the kidneys convert to the (*) secosteroid hormone calcitriol. Deficiency of this vitamin causes osteomalacia in adults and rickets in children, both of which are characterized by softening of the bones. For 10 points, name this vitamin that can be obtained through drinking milk or being exposed to sunlight.
This vitamin promotes cathelicidin production. A polymorphism of the gene coding for this vitamin's binding protein is associated with Graves' disease, and this vitamin's receptors are highly expressed in activated T and B cells.
vitamin {D}