(A, B) (A) Coronal sections of P14 brains stained for calbindin and VgluT1. Infrapyramidal bundle (IPB) progresses into hippocampal CA3 region in both WT and crmp2-/- mice. Nuclei are counterstained with Hoechst 33342. (B) Details from depicted regions in (A), arrowheads show the course of IPB. Scale bars: 100 μm. 