ENP alumna Athena Ypsilanti investigated neuroblasts in the subventricular zone, where undifferentiated cells proliferate and eventually migrate to the olfactory bulb. She and her teammates found that Plexin-B2 lines the ventricles and rostral migratory stream. They conducted other tests that demonstrated other contributions of Plexin-B2 in the proliferation and migration of neuroblasts from this subventricular zone. Check out their techniques in the article:

Saha B, Ypsilanti A, Boutin C, Cremer H, Chédotal A. Plexin-B2 regulates the proliferation and migration of neuroblasts in the postnatal and adult subventricular zone. J Neurosci. 21 Nov 2012. 32(47): 16892-16905.

Figure 2 C' from Saha et al., J Neurosci, 2012. Immunohistochemistry of migrating neuroblast cells, showing Plexin-B2 at the cell surface and GFP in the cytosol.