For the generation of emulsions, 1 mL of fluorinated oil (Novec 7500) and 2 mL protein solution (1 mg/mL in PBS) were added into a glass vial. The vial was shaken using a vortex until the emulsion was created (10 s) and further incubated for 1 h at room temperature. The upper liquid phase was aspirated and replaced with PBS 6 times to wash off excess protein solution.