Short timelapse movie of prechordal plate, hypoblast, and yolk syncytial layer (YSL) nuclear movements during 80-90% epiboly. The prechordal plate and notochord can be seen as a tighter clump of cells at the dorsal midline while the deeper YSL nuclei are the large bright spots. Cell movement in the hypoblast is quite dynamic. Alexa-Histone injected into YSL, free Alexa permeates to label deep cells in blastoderm. Sphere is approximately 700 microns in diameter. Video made available through Mark Cooper and Zebrafish The Living Laboratory.
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