Example of an ESC dividing at the periphery of a 2D colony plated on E-cadherin. Time-lapse (spinning-disk confocal microscopy) of a colony of ESCs expressing H2BRFP (red) plated on E-cadherin and labeled with CellMaskTM deep red (cyan), with one cell dividing at the periphery of the colony. Cell division appears symmetric. One frame is shown every 5 min. One Z plane is shown. Scale bar: 10 μm.