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Embryo transverse (or cross-)sections following whole-mount gfp in situ hybridization on Tg(pbin7Lef-dGFP) embryos, from stage 12.5 to stage 20. For each stage, 7 serial sections are shown. White dotted lines delineate the somites. e: nonneural ectoderm; np: neural plate: brackets indicate the approximate width of the neural plate.
