F, Box plots showing the percentage of Ki67-positive cells in different treatment groups. Data are based on IHC staining of lung tissue section of LSL-KrasG12D mice. *P<0.05 and P＞0.05 (ns) by two-way ANOVA with Tukey's multiple comparisons test. The boxplots span from the first to third quartile, the whiskers extend to 1.5× the interquartile range (IQR). The horzontal line within the boxes represents the median of each group of 10 replicates (n=10). 