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Representative calibration curves and peptide extracted ion chromatograms. (a) LLQV and (b) LEMP peptides. LLOQ: lower limit of quantification; LLQV: LLQVAVEDR; LEMP: LEMPSSLMLEVPTHR; QCH: high quality control; QCL: low quality control; RT: retention time; SIL: stable isotope labelled (peptide); ULOQ: upper limit of quantification.
