Cover Picture: Injection of deep cortical layers of rat frontal cortex with the anterograde tracer PHAL (main picture) results in labeled axon terminals which make synapses on parvalbumin positive dendrites in the contralateral hemisphere (middle insert). A fast spiking parvalbumin positive basket interneuron (lower insert) receives monosynaptic excitation by stimulation of the corpus callosum (top insert). See Karayannis, T, Huerta-Ocampo, I, Capogna, M. 2007. GABAergic and Pyramidal Neurons of Deep Cortical Layers Directly Receive and Differently Integrate Callosal Input. Cereb Cortex 17(5):1213–1226.
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