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Figure 1 Graph showing the four study groups. GdDTPA-albumin (n = 8 in each group) or ¹²³I-GdDTPA-albumin (n = 6 in each group) were injected before reperfusion (group 1); after h (group 2); after 1 h (group 3); after 24 h of reperfusion (group 4). Magnetic resonance imaging in each group was performed over a 1-h period, or hearts were excised 15 min after injection and autoradiography performed. Solid bar = time of coronary artery occlusion (1 h); hatched bar = time during reperfusion at which GdDTPA-albumin or ¹²³I-GdDTPA-albumin were injected and MRI or autoradiography was performed.