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Fig. 9. Ectopic expression of sox9a and sox9b mRNAs causes ectopic expression of other neural crest genes. (A,D,G,J,M) Uninjected controls. (B,E,H,K,N) Embryos injected with sox9a mRNA. (C,F,I,L,O) Embryos injected with sox9b mRNA. (A-C) Embryos probed for sox9a. (D-F) sox9b probe; (G-I) foxd3 probe; (J-L) sox10 probe; (M-O) snai1b probe; vertical line indicates anterior border of the neural plate. Scale bar: in O, 100 µm.