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Table 2 Fraction Aβ 1–20 formed during incubation of CSF at room temperature for 24 h, calculated based on the altered peptide isotope distribution due to the incorporation of H2 18O

From: Ex vivo 18O-labeling mass spectrometry identifies a peripheral amyloid β clearance pathway

  Aβ1-20 Aβ1-40
Patient # Before treatment After treatment Before treatment After treatment
1 1.14 ND −0.03 0.05
2 1.10 ND 0.12 −0.10
3 1.10 ND 0.16 0.04
4 0.59 0.15 0.18 −0.16
5 1.02 0.27 ND 0.04
6 1.06 0.22 −0.08 0.21