24-hydroxylation of 500 nm 3h-labeled 25-hydroxyvitamin d3 [ 25 ( oh ) d3 ] and 50 nm 3h-labeled 1,25 ( oh ) 2d3 by duodenal homogenates was detected 1 h after 1,25 ( oh ) 2d3 treatment ;
C0006657
25-hydroxyvitamin d3
C2713074
25 ( oh ) d3