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Chromatograms of FLIT/FL and FLIT/FLI transitions for endogenous FLIT peptide in tryptic digests of parental NIKS cells (A) or NIKS-4H (B) and NIKS-2L (C) clonal cell lines harboring episomal copies of the HPV-16 genome. FLIT retention times were 28.93 ± 0.1 min (25-cm column).
