All crystals were glued to cantilever (Arrow TL- 1, Nanoworld) with epoxy (21 (link)) at least 12 h before use. All attraction forces between cell and crystal were measured with JPK CellHesion (JPK) (23 (link)). Briefly, the measurement was carried in the relative force feedback contact/tapping mode (IP gain: 50 Hz; IG gain: 0.001 Hz; correct baseline: 1; relative set point: 0.5 nN; z length: 50 µm; extend delay: 0 s; constant height). Data were analyzed with JPK Data Processing. Maximum binding forces were calculated and plotted. Each dot presents a single measurement.
Attraction forces between crystal and lipid monolayer were measured with JPK NanoWizard II (JPK). All set up was the same as the JPK CellHesion except z length was 10 µm. AFM scanning mode was used to confirm domain formation.
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