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Expression of the FGF signalling pathway genes ER81/Erm/Pea3, Sprouty, FGFR, and of the ParaHox genes Cdx and Xlox in L1 control embryos (A, E, I, M, Q), and in embryos treated at the N3 stage with SU5402 (B, F, J, N, R), RA (C, G, K, O, S) or BMS (D, H, L, P, T) (lateral views, anterior to the left). For FGFR and Xlox, dorsal views of the tailbud region are also presented. Scale bars = 50μm.
