Fig. 5From: Reiterative use of FGF signaling in mesoderm development during embryogenesis and metamorphosis in the hemichordate Ptychodera flavaFGF signaling regulates the expression of the mesodermal transcription factor genes in the presumptive mesoderm. In situ hybridization for snail (A1-A3), foxc (B1-B3), foxf (C1-C3), twist (D1-D3) and foxa (E1-E3) in 26 hpf embryos treated with DMSO (A1-E1) or 2.5 μM PD173074 at 18 hpf (A2-E2) or 23 hpf (A3-E3). All panels are shown in the same scale, according to the scale bar (100 μm) in A1Back to article page