Analysis of FGF signaling components in the Fgf15 mutants. (a-l) In situ hybridization on coronal sections: Fgf8 at E12.5 (a, b) and E14.5 (c, d); Spry2 at E12.5 (e, f, i, j) and E14.5 (g, h, k, l). Arrows in (e-h) indicate the change in Spry2 gene expression in the lateral pallium; arrowheads in (e, f) indicate the change in the medial pallium. CP: cortical plate; Se: septum. Bars in (e, g, i, k) are 200 μm.