Fig. 1

UV-Chromatogram of ERLIC from a platelet plasma membrane fraction. (A, B) The majority of peptides reveals only weak or no interaction with the stationary phase and is detected from min 1—12. It is clear that additional peaks in the later fractions after 13 min can be observed in the magnified view (A). Comparison with a blank run (C) confirms the two major peaks at 26 and 28 min to be artifacts, while mass spectrometry proved the remaining signals to be derived from glycopeptides