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"The density and distribution pattern of CR cells were analyzed in horizontal sections through the hippocampal formation using CXCR4-EGFP mice ranging between postnatal days (P) 8ÐP60. Here, CR cells are fluorescently labeled and thus easily identifi- able (Fig. 1A). In fact, within both the hippocampal SLM and the OML of the dentate gyrus, EGFP expression is confined exclusive- ly to CR cells (Fig. 1A, B1ÐB3, C; see also Marchionni et al. 2010; Quattrocolo and Maccaferri 2013). Therefore, despite the pres- ence of EGFP in the dentate gyrus (reflecting the expression of CXCR4 on the membrane of neural stem cells and in their pro- geny; see Bhattacharyya et al. 2008), and in stratum oriens (SO) and stratum radiatum (SR) of the hippocampus proper, the CXCR4-EGFP mouse is a very useful tool to investigate the local- ization, density, and distribution of hippocampal CR cells throughout postnatal development."