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T1-weighted half-life of MCP-PEG10K2 measured using MRI in rats following administration of a dose of 50 µmol Fe/kg. Shown is the course of MRI signal intensity over time. The blood half-lives calculated from the measured data were 54.1 min for animal 1, 86.8 min for animal 2 and 45.4 min for animal 3.
