Fig. 7. Co-transfection of Fgf8b with Otx2. When Otx2 was co-electroporated, the effect of Fgf8b was converted to an Fgf8a-type effect at a concentration of 0.1 µg/µl, 10 times higher concentration than single Fgf8b electroporation. Arrowhead indicates ectopic tectal structure in the metencephalon (D,F). Embryos were fixed at E7.5. Scale bars, 4 mm.