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Nitric oxide (NO) secretion in culture of 10.014 pRSV-T human normal corneal cells during 24 h of incubation with the methanol, ethyl acetate and heptane extracts of E. officinalis L. Two concentrations of the extracts were used: 8 μg/mL and 20 μg/mL. Analysis was performed using the Griess method. Columns and bars show the mean±standard deviation (n=3). *p≤0.01 - culture of corneal cells treated with plant extracts compared to the non-treated culture control
