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Figure 5


Fig. 5. Structure of the lamella for the 4.6 µm phagocytosis at 55 seconds (see boxed area in Fig. 3). (Top) Cytoskeletal volume fraction and velocity field with respect to the bead (substratum frame). (Bottom) Polymerization messenger concentration and cytoskeletal velocity field with respect to the cell (lamella frame). The white patch of membrane corresponds to the region of enhanced messenger emissivity. Notice that, the velocity of the cytoskeleton vanishes in the substratum frame at the cell-bead interface due to the no-slip boundary condition. Notice also the high density of cytoskeleton at that same interface due to the contractile force directed down toward the substratum.





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