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In situ hybridization for HOXA3 (A,B,C) and SOX10 (D,E,F) in sections made through the IXth (A,D) and Xth (B,E) nerve, and the distal ganglion of the Xth nerve (C,F). The bracket in “A” indicates the petrosal placode; XII in “C” and “F,” the XIIth nerve; IXp.g. and IXd.g. in “D,” the proximal and distal ganglion of the IXth nerve, respectively; and Xd.g. in “F,” the distal ganglion of the Xth nerve.
