after administration of cholecalciferol into the animals deficient in vitamins d and b2 within 24 hrs or 6 days before death restoration of the calcium metabolism parameters was retarded as a result of less distinct stimulation of i-hydroxylase and of low activity of 24-hydroxylase 25-oh d3 in kidney as well as due to a moderate increase in content of bound receptors of 1,25 ( oh ) 2d3 in small intestine mucose and , apparently , because of reduced production of the proteins dependent on vitamin d in the tissue ( ca2+-atpase and alkaline phosphatase ) .
C0008318
cholecalciferol
C2713074
25-oh d3