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Fig. 4 Sections through the trunk region showing expression of Snail: (A) dogfish; (C) zebrafish snail2; (G) mouse; and expression of Slug: (J) lizard; (K) turtle; and (L) chick in the pnc. Yellow stars indicate those genes expressed in this population in each species. n, notochord; ne, neural epithelium; nt, neural tube.
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