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Representative chromatograms of extracted double blank urine (A and D—0 ng/mL i.e. no analyte or IS), and urine samples spiked with thymidine and 2’-deoxyuridine at the LLOQ (B and E: 1 µg/mL) and upper limit of qualification (C and F: 50 µg/mL). Thymidine: panels A, B and C; 2’-deoxyuridine: panels D, E and F.
