Retroviral assembly is directed towards sites of cell-cell contact. Time-lapse video monitoring the cell-cell interaction between a HEK293 cell producing MLV without coexpression of dynamin2-CFP and a HEK293 cell expressing mCAT1-CFP. The video is played at 10 frames/s. Video S7 corresponds to Figure 7K. Statistical data for this video can be found in Table S2.