Branching in primary wildtype mouse hippocampal neurons after Netrin-1 or FGF-2 stimulation. 30-hour phase-contrast time-lapse movie with 10 min intervals starting at day in vitro 2. Treatments were applied one hour before imaging. Netrin-1: 100 ng/ml, FGF-2: 20 ng/ml. Scale: 20 μm.