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Graphic representation of concentrations of hydrogen peroxide (H2O2) as produced by conjunctival (CCC; Wong-Kilbourne derivative of conjunctiva, clone 1–5c) and human corneal (HCE; 10.014 pRSVT) epithelial cells after being put into contact for 1 h with varying concentrations of benzalkonium chloride (BAK) as compared to media alone. Probability (P) values of statistical comparisons of BAK concentrations from 0.01 to 0.005 are significantly different, lower concentrations are not.
