Purified Drosophila Delta and Serrate NE3 proteins bind to liposomes (D) Binding is reduced in Delta∆β1-2, but not to the Serrate equivalent using liposomes composed of PC:PS:PE-fluoroscein (80:15:5). Notch binding to Drosophila Delta NE3 (E) WT and ∆β1-2 (Delta∆β1-2) variants both bind to Notch, unlike variant with F204A substitution in DSL domain. Comparisons were performed with a two-tailed unpaired t-test. Values are shown as scattered data points with the dark lines representing the means. ns, no significant difference, **P < 0.01; ***P < 0.0001. 