the km for 1,25 ( oh ) 2d3 was approximately 10-fold lower than that for 25-hydroxyvitamin d3 [ 25 ( oh ) d3 ] , indicating that 1,25 ( oh ) 2d3 is perhaps the preferred substrate under physiological conditions .
C0006657
25-hydroxyvitamin d3
C2713074
25 ( oh ) d3