Fig. 4

Actin cytoskeleton network morphology of non-infected primary murine neurons. Various forms of actin fibres structures were presented and highlighted by white arrowheads: tunnelling nanotube (main image), filopodium (a) and longitudinal actin fibres (a’), stress fibres (b), peripheral stress fibres (c), lamellipodium (d), and growth cone (e). Indirect and direct immunofluorescence staining; merge images: actin filaments – red; cell nuclei – blue. Microscope magnification 60x, scale 20 μm