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Effect of the 48-hour treatment with quercetin (5 and 50 μg/mL) on nitric oxide production (NO) by swine granulosa cell cultured in vitro. Data represent the mean ± SEM of six replicates/treatment repeated in four different experiments. Different letters indicate significant differences (P < .001) calculated by ANOVA and Scheffè's F-test (Statgraphics package, STSC Inc., Rockville, Md, USA).
