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(a) Matrix-free LDI MS and (b) MALDI MS analysis of standard peptide calibration mixtures containing 1.6 pmol of des-Arg1-Bradykinin (calc. MH+ 904.47); 2.1 pmol of Angiotensin I (calc. MH+ 1296.69); 2.1 pmol of Glu1-Fibrinopeptide B (calc. MH+ 1570.68); and 80 fmol of Neurotensin (calc. MH+ 1672.92).
