Effects of salbutamol (SAL) and indometacin (IND) on reduced glutathione (GSH) level in carrageenan-injected-paw tissues. Means in the same column by the same letter are not significantly different and the means in the same column by different letters demonstrate significant differences between the groups according to the Duncan test (). In the above figure, the letter for the means in SAL-2, IND, and healthy columns is the same: “c.” This demonstrates that values in these lines are not statistically different from each other. However, the lines with the letter “c” are statistically significant from the lines with the letters “a” and “b.”