F-actin 3D reconstruction of 3D reconstruction F-actin filaments Electron-micrograph of containing negatively stained F-actin Model of an F-actin of an F-actin tropomyosin, filamentin which each filament from filaments an elongated protein sub-unit is depicted as muscle. which binds along the a sphere. actin helix3D reconstruction of an F-actin filament from muscle. 3D reconstruction of F-actin filaments containing tropomyosin, an elongated protein which binds along the actin helix Model of an F-actin filament in which each sub-unit is depicted as a sphere. Electron-micrograph of negatively stained F-actin filaments. F-actin