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USPIO enhancement after single-dose administration in the first week following MI. Following single-dose administration, USPIO enhancement was detected in all myocardial regions at 24 hours. USPIO was detected in bone marrow until 4–9 days, and spleen and liver until 13–21 days (****p<0.0001, ***p<0.001, *p<0.05); n = 21 (baseline, 24 hours), 11 (days 4–9), 15 (days 13–21) and 5 (days 78–99). MI, myocardial infarction; USPIO, ultrasmall superparamagnetic particles of iron oxide.
