the production of 1 alpha,25-dihydroxycholecalciferol ( calcitriol ) was linear with time for up to 6 h and was directly proportional to the number of cells up to 20 x 10 ( 6 ) /dish at a substrate concentration of 100 nm .
C0012328
dihydroxycholecalciferol
C0006674
calcitriol