NAV1 depletion impairs axon turning toward a netrin-1 gradient. Related to Fig. 2. Phase-contrast time-lapse microscopy of control (shRNA-luc) and NAV1-depleted (shRNA-NAV1#1) neurons exposed to netrin-1 in a Dunn chamber. The higher concentration of netrin-1 is at the top of the images. Time interval: 4 minutes.