Figure 4

The osteoblast differentiation of MC3T3-E1 cells under the stimulation with daily stimulation time of 0.5, 1 and 24 h/d for 7 and 14 days. **p < 0.01.

The osteoblast differentiation of MC3T3-E1 cells under the stimulation with daily stimulation time of 0.5, 1 and 24 h/d for 7 and 14 days. **p < 0.01.