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Vasodilator response of isolated and pressurized porcine retinal arterioles to sodium nitroprusside. Concentration-dependent vasodilation to sodium nitroprusside was unaltered following all three time periods of diabetes mellitus: (A) 2 weeks (control and diabetes = 7 pigs each), (B) 6 weeks (control and diabetes = 4 pigs each), and (C) 12 weeks (control = 4 pigs; diabetes = 8 pigs).
