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Fig. 9. Effects of injection of dnHrFGFR mRNA on expression of HrTBB2, assessed by whole-mount in situ hybridization. (A) Expression of HrTBB2 in a control tailbud embryo. Signals are evident in neuronal cells (nu) in the anterior and dorsal trunk and dorsal tail regions. Embryo injected with (B) HrFGFR mRNA and (C) dnHrFGFR mRNA. The expression pattern of HrTBB2 is disturbed. Scale bar, 100 µm for all panels.