To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 2. Beating chimeric gastruloid. A chimeric gastruloid composed of WT and TRE.Eo cells at 168 h that displays a beating domain as a result of the induced overexpression of Eomes. Scale bar 100 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