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Maximum intensity projections of mice prior to and 1 min after injection of 0.2 mmol/kg Fe3+-PyC3A (A, B) or 0.2 mmol/kg Fe2+-PyC3A (C, D). Strong signal enhancement of the blood pool is observed 1 min after injection of Fe3+-PyC3A, whereas Fe2+-PyC3A provides virtually no signal enhancement. The scale bar represents the signal intensity.
