 ELISA plates were coated with purified soluble TREM2-Fc, and then incubated with various concentrations of Aβ42 monomer Binding of Aβ42 monomers with soluble TREM2-Fc shows a dose dependent signal. Results were expressed as the OD450 averaged ± standard error (n =3; * p<0.05, ** p<0.01, *** p<0.001, **** p < 0.0001, Two-way ANOVA, Bonferroni multiple comparisons, see Appendix table S2 for p value) 