Fig. 2
From: Ex vivo 18O-labeling mass spectrometry identifies a peripheral amyloid β clearance pathway
MALDI-TOF mass spectra of the CSF Aβ pattern after incubation with a 0%, b 0.05%, c 0.5% and d 5% human blood. The inset shows the degradation of Aβ1-16, and the vertical dashed line indicates its monoisotopic m/z. * represents an unidentified peak, of three Da higher mass than the monoisotopic peak of Aβ1-16. The Arg13C15N will appear as a mass shift of 10 Da relative the endogenous peptide as seen for Aβ1-19 and Aβ1-20