to clarify the state of vitamin d production by the developing kidney , firstly , we measured serum levels of 1,25 ( oh ) 2d and 24,25 ( oh ) 2d in humans of different ages ( pregnant and nonpregnant women , adult males , children and newborn infants ) and secondly , we measured 1 alpha- and 24-hydroxylase activity in the kidney mitochondria of rats at different ages .
C0008059
children
C0021289
newborn infants