Sagittal E18.5 Nestin-Cre;Pitx2flox/+ and Nestin-Cre;Pitx2flox/tlz littermate brains processed for single in situ hybridization for Pitx2, Gad1, or Vglut2 or immunohistochemistry with antibodies against 5-HT. (A) Cartoon of a sagittal section showing the orientation of panels B–G. (B–G) Merged images of neighboring sections processed for in situ hybridization for Pitx2 and either Gad1 (B, E), Vglut2 (C, F), or 5-HT (D, G) immunohistochemistry and pseudocolored. Scale bar in B is 200 µm and applies to panels B–G.