using a 24 h preincubation period with no added vitamin d3 derivative , a steep dose-response curve could be obtained with 1 alpha,25- ( oh ) 2-d3 over a range of 2-10 pg/ml during a subsequent 96 h incubation period , and 1 alpha,25- ( oh ) 2-d3 was found to have about 5000 times the activity of 25-oh-d3 .
C0008318
vitamin d3
C2713074
25-oh-d3