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Chromatograms of FLIT/FL and FLIT/FLI transitions for endogenous FLIT peptide in tryptic digests of C33A (A), SiHa (B), Caski (C), and HPV-16 E6/E7-immortalized HECs that stably express wt 16E5 (D). FLIT retention times were 25.10 ± 0.4 min (15-cm column).
