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Chromatograms of drug-free and drug-spiked whole-blood DBS for the monitoring of ion transitions for rifapentine (A), desacetyl-rifapentine (B), and [2H3]rifampin (C). The drug-spiked whole blood concentration was 50 ng/ml (LLOQ) for both drugs, and the internal standard concentration spiked was 500 ng/ml.
