Fig. 5. Phase transitions and local autonomy of veils. Panel construction as in Fig. 4. (A) Left: nascent protrusion (3.6 µm/minute) characterized by dense branched network is demarcated from surrounding sparse network. Right: protruding (7.6 µm/minute) and retracting veil (2.8 µm/minute) adjacent to same filopodium show distinct filament organization: dense branched vs sparse, respectively. (B) Electron micrographs of the regions of interest from the time lapses in A. (C) Higher magnification of the boxed region in B. The new protrusion (left) is sharply demarcated from the local network (dashed line). Adjacent filopodia associated veils (right) have independent behavior.