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Fig. 1. Comparative analysis of the expression of transcription factors, such as
Sox9, Msx1, Msx2, Foxd3, Sox10
and Snail2, from a dorsal view. Stage 6-9 embryos were sagittally
bisected, and the right halves were hybridized with Snail2 probe,
while the left halves were hybridized with other probes for close comparison.
Arrowheads indicate expression in the head neural folds. Asterisks indicate
expression of Sox9 and Foxd3 in the midline tissues.