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

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

	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