To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1. Merging process of preformed ESC aggregates. A 12 h time-lapse movie showing the merging process of preformed ESC aggregates that adhere quickly and reorganize again into one round aggregate. Scale bar 200 μm. Chimeric 3D gastruloids – a versatile tool for studies of mammalian peri-gastrulation development Alexandra E. Wehmeyer, Katrin M. Schüle, Alexandra Conrad, Chiara M. Schröder, Simone Probst, and Sebastian J. Arnold Development 2022. 149:None-None; doi: 10.1242/dev.200812 Download Original Video