No obvious defects in axonal projections of CSNs to the red nucleus or brainstem in Npn-1fl/fl; Emx1-Cre mice. A, B, TdTomato+ axonal projections of CSNs in the red nucleus in Npn-1fl/+; Emx1-Cre (A) and Npn-1fl/fl; Emx1-Cre (B) mice. C–F, TdTomato+ axonal projections of CSNs in the brainstem in Npn-1fl/+; Emx1-Cre (C, E) and Npn-1fl/fl; Emx1-Cre (D, F) mice. E, F, Higher magnifications of C and D, respectively. Scale bars, 100 μm.