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Fig. 6. Epistatic analysis of the function of Fgf and RA in patterning the neural ectoderm. Dorsal views of whole embryos at late gastrula stage. RNA for fgf3, alone or together with cyp26 RNA, was injected at the one-cell stage. The embryos were stained for hoxb1b (A-C) or otx2 (D-F). XFD mRNA was injected at the one-to-two cell stage, and half of the embryos were treated with RA. Embryos were stained for hoxb1b (G-I) or otx2 (J-L).





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