Cover Picture: Spines on basal dendrites of CA1 pyramidal cells, visualized in brain sections of Thy1-mGFP transgenic mice (Green, confocal images processed by deconvolution), altered after exposure to novel, enriched environment for a brief period (60 min). The difference was selectively found in Arc/Arg3.1 (a putative neuronal activity marker)-expressing neuronal population (Purple ellipses illustrate the immunoreactivity in the soma). Blue ellipses depict soma of Arc negative neurons. See Kitanishi et al. 2009. Experience-dependent, rapid structural changes in hippocampal pyramidal cell spines. Cereb Cortex 19(11): 2572-2578.
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