To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1. Time-lapse imaging tracks the EHT process in spi2 siblings. Photoconverted HECs are labelled in red color. Lines denote DA roof and floor, and triangles denote an example of observed HEC in a spi2 sibling embryo. The ETS transcription factor Spi2 regulates hematopoietic cell development in zebrafish Shizheng Zhao, Ao Zhang, Hao Zhu, and Zilong Wen Development 2022. 149:None-None; doi: 10.1242/dev.200881 Download Original Video