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Fig. 4. Inhibition of Fgf activity prevents formation of vegetal prospective neural
tissue. Lateral views with dorsal right of gastrula stage embryos (80-90%
epiboly). Wild-type embryos (A,E,G,I,K) and embryos treated with SU5402, a Fgf
receptor inhibitor (B,C,D, with 60 µM SU5402; F,H,J,L, with 90 µM)
labelled to show sox3 (A-D), sox31 (E,F) and zix2.2
(G,H) expression, the anterior neural marker gene, otx2 (I,J), and
the non neural marker gene, p63 (K,L). The arrowheads in AD indicate
the variable decrease in vegetal sox3 expression and the asterisks
show that the animal (anterior) domain of sox3 expression is largely
unaffected (although repositioned closer to the vegetal side of the
embryo).