<p>MC3T3 osteoblasts were transfected with siRNA control or siRNA against HIF-1α. RNA was isolated 24 hr post-transfection and quantitated by quantitative real-time RT-PCR for HIF-1α and Sost, and HSP90 was used as a negative control. The RNA level from the control siRNA group was normalized to a value of 1. Values were presented as the mean ±S.D. si-control: si-RNA control; si-HIF-1α: si-RNA against HIF-1α. A paired <i>t</i>-test was performed comparing si-control group and si-HIF-1α group. *: A star indicates statistical significance compared to control group.</p
