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Figure 1 A representative example of a heart after 30-min coronary occlusion and 90-min reperfusion. (A) Triphenyltetrazolium chloride stained the noninfarcted region red, and the infarcted region remained unstained. The nonischemic region was stained by Evans blue dye. (B) Under ultraviolet light, the no-reflow zone was identified as a region deficient in fluorescence of thioflavin-S.