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Fig. 1 syn4 is expressed in the migrating NC. (A-L) Lateral views of zebrafish (A-F) and Xenopus (G-L) embryos. Anterior is to the left. (A,D) 12- to 14-somite embryo. (B,E) 20-somite embryo; (C,F) higher magnification of the trunk region in B,E. (A-C) syn4 expression; (D) sox10 expression; (E,F) crestin expression. Note that the expression of syn4 in the migrating NC cannot be distinguished from the expression of the NC markers. (G,J) Stage 26 embryo. (H,K) Stage 30 embryo. (I,L) Cephalic region of a stage 35 embryo. (G-I) syn4 expression. (J) twist expression. (K,L) fli expression. Note the expression of syn4 in the migrating cephalic NC.