Figure 2.

(A) A 3D representation of a unit cell as a single cubic cavity with edge size L with reflecting walls and apertures, the precursor for the mucus model. The red sphere depicts a tracer particle. (B) Representation of the model using permeable membranes as interfaces is shown. (C) Exemplary trajectories of particles as 2D projection are illustrated to visualize the Brownian diffusion inside the cavity and the restricted passing through the membranes, shown as black dashed lines. To represent the trajectories, we use the initial position as the center of the cavity, indicated by the yellow cross; otherwise, in the simulations, the initial positions are random. To see this figure in color, go online.