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Figure 3 Systolic thickening fraction in group I (control). Illustrated is thickening fraction at baseline, just before the first occlusion (Pre-O), 3 min into each coronary occlusion (O), 3 min into each reperfusion (R), and at selected times during the 5-h reperfusion period after the sixth occlusion. Thickening fraction is expressed as a percentage of baseline values. The two comparisons performed at each time-point from 5 min to 4 h of reperfusion were adjusted with the Bonferroni correction. Data are means ± SEM.