This sequence shows actin nucleation on the dorsal surface of an advancing lamellipodium. Small actin nucleations have been termed inductipodia in nerve growth cones, since they can be induced by latex beads landing of the cell surface. Gold beads also elicit this behavior. However, in these cells, the structures are forming spontaneously. One can also see small retrograde flows of actin occuring from the distal margin of the advancing lamellipodia. Video made available by Mark Cooper thru Zebrafish - The Living Laboratory.