extremely significantp < 0.0001
Figure 4 shows a bar graph of the average A , ε m a x , ε ∞ , τ r of the 4 cell lines and indicates the level of significance: where p > 0.05 is not significant (ns), 0.01 < p < 0.05 is significant (*), 0.001 < p < 0.01 is very significant (**), 0.0001 < p < 0.001 is extremely significant (***) and p < 0.0001 is extremely significant (****), raw values can be found in Table S1 .