The dataset shown represents a timelapse sequence showing cell and tissue dynamics during primitive streak formation in chick embryo. The data were acquired using Myr-GFP embryos and a custom built light-sheet microscope. The sequence shows the developmental period covering the time interval from the freshly laid egg (stage EGXIII), prior to the onset of tissue movement until the end of the formation of the primitive streak (Stage HH4). Shown here is only one of the...