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Neuronal uptake and clearance kinetics of [11C]phenethylguanidines in the isolated rat heart. A: Five of the six compounds that exhibited long neuronal retention times. For clarity, compound [11C]1d is not shown due to its similar kinetics with [11C]1k. B: The unsubstituted reference compound [11C]1a and the three analogs with a single ring fluoro-substitution.
