A rare X-linked dominant form of rickets is resistant to this vitamin.
The genotype of this compound's receptor significantly correlates with disease subtype in leprosy patients. Several failed anticancer clinical trials used a macrophage-activating factor derived from gc-globulin, to which the majority of this compound is bound in the bloodstream. It's not an estrogen, but this compound is the most prominent "seco," or broken-ringed, steroid in the body. A precursor to this compound is formed by a six-electron conrotatory ring-opening of 7-dehydrocholesterol. This compound is hydroxylated at the 25 and 1-alpha positions in the liver and kidney, respectively, to yield its biologically active form, calcitriol. A rare X-linked dominant form of rickets is resistant to this vitamin. For 10 points, name this vitamin that regulates calcium homeostasis, and is produced in the skin upon ultraviolet exposure from sunlight.
The genotype of this compound's receptor significantly correlates with disease subtype in leprosy patients.
Vitamin D [or Vitamin D1; or Vitamin D2; or Vitamin D3; or Vitamin D4; or Vitamin D5; or ergocalciferol; or lumisterol; or ergosterol; or cholecalciferol; or 22-dihydroergocalciferol; or sitocalciferol; accept calcitriol until it is read] &lt;Biology&gt;