Urge to merge erects filopodia rawling cells often produce both broad, flat lamellipodia and long, thin filopodia. Once formed, both structures appear to use an actin-treadmilling mechanism to extend themselves. During treadmilling, lamellipodia continuously nucleate new filaments, but filopodia continue to use the same filaments. So how does a cell form a filopodium in the first place? Svitkin...
