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Figure 1: Multiple Reation Monitoring (MRM) transitions for internal standard, D5-fentanyl (m/z 342 → m/z 188) (left column) and fentanyl (m/z 337 → m/z 188) (right column) in a) lowest serum calibrator 0.05 ng/mL; b) patient sample (0.24 ng/mL); c) blank serum.
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