Fig. 3From: Ex vivo 18O-labeling mass spectrometry identifies a peripheral amyloid β clearance pathwayMass spectra of PBS spiked with Aβ1-40 Arg13C15N, incubated overnight in the absence (a) and presence (b) of 0.5% blood. In b, Several Aβ degradation products are detected as well as a cluster of signature peaks from blood in the mass range 3300 – 3600 Da, the identities of which are unknownBack to article page