Epifluorescence microscopy, fluorescence recovery after photobleaching (FRAP) and data analysis. Fluorescence microscopy images were acquired with a Leica DMi8 fluorescence microscopy and images were analysed in Fiji ImageJ. Emulsions were prepared according to the protocol described above, using the labelled proteins (fluorophores: 594 nm for BSA and 488 nm for β-casein). An emulsion volume of 10 μL was placed in a microwell plate filled with 200 μL of PBS. Images were acquired with a Nikon CSU-W1 SoRa Spinning Disk Confocal with a 63x oil objective.