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Figure Caption
Fig. 3 RB sensory neurons are born during gastrulation in zebrafish. A-D: Confocal micrographs of dorsal views of the spinal cord in 24-hpf Tg(neurogenin1:GFP) embryos, in which RB neurons express GFP. Embryos were treated with BrdU from high stage (A), 50% epiboly (B), tail bud (C), or 2 somites (D) through 24 hpf. In embryos treated from high stage or 50% epiboly (A,B), most of the RBs show BrdU incorporation, while in embryos in which BrdU exposure began at tail bud (C) or 2 somites (D), few RBs show BrdU incorporation.
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