Lhx9 expression at E13.5.A, Sagittal section through the entire brain.B–F, coronal sections through the telencephalon and diencephalon (plan of section indicated by white bars inA) showing Lhx9 transverse boundaries in the rostrocaudal extension. The dotted line indicates the zli. Scale bars, 100 μm. See Table 1 for anatomical abbreviations.