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Quantification of proteins in plasma. A total of 360 transitions were acquired by scheduled SRM to quantify 60 peptides in plasma samples following glycocapture. Traces for one peptide in 1 out of 100 analysed samples are shown. On the basis of the heavy isotope-labelled peptide (dashed lines), the concentration of the endogenous protein (solid lines) was estimated to be 5 ng/ml.
