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Effect of myocardial tissue nitrite reductase on average NO concentration in the smooth muscle cell region (15 < r < 25 μm) as a function of blood PO2 for tissue pH values of (A) 6.85 and (B) 5.5. The higher section of blood PO2 is omitted because the change in average SMC NO between blood PO2 values of 35 and 120 Torr is <1 nM.
