Figure 2.

Concentration – response curves for 5-chloro, 5-nitro and 5-methyl-1,10 phenanthroline in comparison to the relation for the parent compound, 1,10-phenanthroline, measured as short circuit current in mouse colonic epithelia. In this and all other figures, mean values, in μA cm⁻², and standard errors of the mean are illustrated, with the number of observations shown on the figure itself. ΔSCC indicates the change in short circuit current.