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Figure 4  R1 and radioactivity ratios of reperfused infarct/blood (A) and normal/blood (B). When tracers were injected before reperfusion, at  , 1 or 24 h of reperfusion, there were no significant differences between R1- and radioactivity-ratios. However, both ratios decreased when the tracers were administered after reperfusion as compared to administration before reperfusion (*p < 0.01), and decreased further at 24 h of reperfusion as compared to 1 h of reperfusion ( p < 0.05). Solid bars = R1-ratio; white bars = radioactivity-ratio.
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