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. 2017 Feb 20;12:18. doi: 10.1186/s13024-017-0152-5

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Mass 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 unknown