Figure 4. Effect of NaF on apoptosis-related protein in mice spleen at 21(A) and 42 (B) days of age. (a) The western blot assay. (b-d) Quantitative analysis of protein expression. Data are presented with the means ± standard deviation, * p < 0.05, ** p < 0.01, compared with the control group. Data were analyzed by the variance (ANOVA) test of the SPSS 19.0 software.