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Fig. 4. fork head is necessary for the initiation of sens expression in the placodes. (A-C) sens mRNA expression is observed in the salivary placodes of wild-type (A) and hkbAI7{Delta}2 (C) embryos but not in fkhXT6 (B) embryos. The arrowhead (B) indicates the continued expression of sens in the PNS neurons in fkhXT6 embryos.