Figure 1. Observed dynamic heterogeneity in the AChR trajectories.

(a) Overall 130 representative AChR trajectories with 300 time steps (60 s). These trajectories are taken from the bottom membrane of a Xenopus muscle cell. Red trajectories indicate fast moving AChRs and black ones indicate ‘nearly immobile' AChRs. (b) A total of 52 representative trajectories of silica spheres 2.14 μm in diameter undergoing Brownian diffusion in water over a flat substrate with 1,000 time steps (47 s).