“…The TUNEL-staining results seen in the SEL [see Fig. 2(C)] are interesting, because the layer primarily contains neuroblasts migrating into the bulb (Altman, 1969;Kishi, 1987;Frazier-Cierpial and Brunjes, 1989;Kishi et al, 1990;Luskin, 1993;Yokota et al, 1993;Lois and Alvarez-Buylla, 1994;Craig et al, 1999). Intriguingly, NMDA receptors have been found on immature migrating cortical neurons (Lo-Turco et al, 1991), and evidence has implicated a role for NMDA receptor activation in promoting migration (Komuro and Rakic, 1993;Behar et al, 1999).…”