in our study , a 50 % displacement of radiolabeled 25-hydroxyvitamin d3 ( [ 3h ] 25ohd3 ) from its initial binding is achieved with 325 fmol/ml 25 ( r ) ,26 ( oh ) 2d3 and 850-1000 fmol/ml 25 ( s ) ,26 ( oh ) 2d3 -- a difference in potency of approximately 3-fold .
C0006657
25-hydroxyvitamin d3
C2713074
25ohd3