Fig. 4

A quantitative proliferation index is correlated with in vivo optical redox ratio measurements. a A proliferation index measuring the ratio of DAPI-stained cells expressing Ki67 in the epithelial tongue revealed differences across time points (p < 0.02). Boxes correspond to the first and third quartiles, and whiskers extend to the full range of the data. b Proliferation index correlates with the mean in vivo redox ratio of the epithelial tongue