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. Author manuscript; available in PMC: 2016 Jul 21.
Published in final edited form as: Clin Chem. 2014 Apr 21;60(9):1217–1224. doi: 10.1373/clinchem.2014.222455

Fig. 2. Typical isotope-enrichment curves for peptides ITKPALLVLNEHTAK (CETP) and GTVSGTLIGLEFIR (PCSK9) for a clinical period.

Fig. 2

Background from natural isotopes of M0 was subtracted to calculate isotope enrichment.