“…After a selection procedure based on the presence of calibrant peptides at a predefined S/N level 301 MALDI‐TOF and 314 MALDI‐FTICR spectra remained . The m/z ‐values in the profiles were compared to a previously reported list of ‘MALDI MS profile peaks’ . Six of these identified peptides were selected for internal calibration, with calculated m/z ‐values of monoisotopic peaks of protonated species at 1206.5749 (fibrinopeptide A (FPA) 5‐16, P02671), 1350.6284 (FPA 3‐16, P02671), 1616.6594 (FPA 1‐16 + P, P02671), 2021.1039 (complement C3f fragment, P01024), 2931.2915 (fibrinogen alpha (FGA) chain precursor 576‐601, P02671), and 3261.4641 (FGA chain precursor 576‐604, P02671).…”