Table 1

Effect of tumor necrosis factor-α on cell viability in MC3T3-E1 cells

Culture time /optical density value (hours)	Control	1 ng/mL	5 ng/mL	20 ng/mL	100 ng/mL
24	0.860±0.025	0.843±0.056	0.805±0.033	0.790±0.142	0.613±0.137*
48	0.812±0.053	0.805±0.123	0.773±0.152	0.734±0.045	0.547±0.173**
72	0.787±0.104	0.810±0.089	0.750±0.063	0.587±0.245**	0.398±0.067**