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Endothelium-dependent dilation of rat gracilis muscle arterioles in response to receptor-dependent and -independent agonists before and then after exposure to Nω-nitro-L-arginine methyl ester (L-NAME). Top panel: arterioles from 25-28 day-old rats. Bottom panel: arterioles from 42-46 day-old rats. Values are means ± SEM. n = number of vessels. *p <0.05 vs. Control. Data derived from Balch-Samora et al., 2007 (Ref. 6).
