SEMA3E and infection: First, we injected lentivirus encoding Venus into the V-SVZ of Sema3E+/− (control) and Sema3E−/− (Sema3E-KO) mice (Gu et al., 2005) at postnatal day 1 (P1) and analyzed the dendritic morphology of Venus+ granule cells in the GCL at 10 days post infection (dpi) (Figure 1A).