Fig. 4From: In vitro toxic evaluation of two gliptins and their main impurities of synthesisEvaluation of nitric oxide levels in 3 T3 cells 24 h after incubation with drugs and impurities: a sitagliptin – STG and its impurities S1 and S2, b vildagliptin – VLG and its impurities V1 and V2. Results are expressed as mean ± standard error of the mean. Statistical analysis performed through ANOVA/Bonferroni (*p < 0.05; **p < 0.01 versus control)Back to article page