DA3 cells expressing the fluorescent protein mCherry were grown to 90% confluence in wells of 2 cm diameter in DMEM supplemented with 10% heat-inactivated FCS (Gibco-BRL) and treated with or without the Met inhibitor PHA665752 (2.5 µM) for 2 hrs. A scratch was generated using a 200 µl tip, and the cells were incubated with or without 80 ng ml-1 Met-Hepatocyte Growth Factor/Scatter Factor (HGF/SF) and subjected to time lapse confocal laser scanning microscopy (CLSM-510, Zeiss, Germany) for approximately 26 hrs, with images taken at 14.5 min intervals. The position of each scratch was predefined, and a macro that repetitively positions the microscope on each point was executed. The acquired differential interference contrast (DIC) channel of the time-lapse sequence (shown here) was used for the multi-cellular analysis; the red fluorescence channel was exploited for single cell tracking. See also: Zaritsky A, Natan S, Ben-Jacob E, Tsarfaty I (2012). Emergence of HGF/SF -induced Coordinated Cellular Motility. PLOS ONE 7(9): e44671