Expression of DCX and EGFP outside of neurogenic areas. Low levels of DCX expression can be detected outside of neurogenic areas. For example, DCX-expressing cells were detected by immunohistochemistry in the piriform cortex (a) and in the corpus callosum (b). Accordingly, EGFP-expressing cells were detected following TAM administration in the piriform cortex (c) and corpus callosum (d). Scale bar in (a) = 33 μm; Scale bar (b), (c) and (d) = 50 μm.