cytosols were centrifuged on 5-20 % sucrose gradients after labeling with tritiated 1,25 ( oh ) 2d3 ( 3h-1,25 ( oh ) 2d3 or 25-hydroxyvitamin d3 ( 25 ( oh ) d3 alone or in the presence of a large excess of these unlabeled sterols .
C0006657
25-hydroxyvitamin d3
C2713074
25 ( oh ) d3