We use a laser confocal microscope to investigate the GCC dynamics in liquid condition to simulate the movement of GCC in lymph fluid. In such a system, there is only a small adhesion force between cells, so that the GCCs tend to be spherical due to cortical tension. We find that the dynamics of GCCs demonstrates similar behaviors as that of glassy liquids, e.g., dynamical slowdown and dynamical heterogeneity, which is mainly controlled by the area fraction of the system and the cells' own viability. The work has been published on Phys. Rev. E , 104, 064402(2021).  ( PDF )