Integration of filopodia into lamella cytoskeleton. (A) Electron micrograph of region corresponding to the terminal frame in Fig. 4 C. (B) Enlargement of A (small box) showing central region of filopodium bundle in the lamella. (C) End region of the filopodia bundle (large box in A) showing splaying of filaments into adjacent bundles of the lamella (indicated by white arrows; also depicted in the inset). See Fig. S2 .