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Figure 4: Duodenal nitric oxide level (μg/g of tissue) in rats. Analysis of variance significance (Bonferroni's test, each bar represents mean ± standard error of the mean, n = 6) Group 1 versus Group 2, 5 and 6, *P < 0.0001, **P < 0.001, ***P < 0.01 Group 2 versus Group 3, 4, 5 and 6, ^{#}P < 0.001 
