Cover Picture : Camera lucida reconstructions of mono-synaptically connected layer 4 spiny neurons and layer 2/3 pyramidal cells in rat barrel cortex, superimposed and aligned with respect to the barrel centre. The dendritic domains of the presynaptic neurons are shown in red, those of the postsynaptic neurons in white and the axons of layer 4 spiny neurons in blue. The outlines of three average barrels (thick white) are indicated symbolically. See Lübke et al., pp. 1051-1063.
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