Cryo-transmission electron microscopy was used to determine the size and internal ordering of LLC particles as described in results and discussion sections. Samples (3.5 µL; ~10 mg/ml) were transferred onto a carbon grid (Quantifoil™ R 2/2 on 300 copper mesh; Jena Bioscience), in a Vitrobot (ThermoFisher) at 95% humidity. Sample grids were blotted (blot time: 2 s; blot force: -2; wait time: 30 s) then immediately plunged into liquid ethane bath within a liquid nitrogen reservoir. The grid was carefully transferred to a grid holder contained within the reservoir and kept at below -180 °C. Grids were transferred under liquid nitrogen to an electron microscope sample holder (Cryo Transfer Tomography holder, Eden Instruments; Model 2550). Defocus values (generally between and -5 µM) were determined elsewhere on the grid to avoid sample damage from the electron beam. Instrument and camera used: FEI Tecnai12 bio twin 120kV with TVIPS XF416 4K CMOS detector. Image handling and analysis was carried out using ImageJ software. Samples were concentrated 100-fold using Amicon centrifugal filter units at rcf. 30 k for 10 minutes (Amicon® Ultra-4 Centrifugal Filter Unit).