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Fractions (mean ± SD) of unchanged 11C-tariquidar (open squares, n = 5) and 11C-elacridar (open circles, n= 5) in arterial plasma over time as determined by solid-phase extraction assay. The shown values are not corrected for recoveries of 11C-tariquidar and 11C-elacridar, which ranged from 91-94%.
