The specificity of connections made by inhibitory interneurons in the neocortex is not well understood. In this issue of Neuron, Fino and Yuste (2011) use an enhanced version of two-photon glutamate uncaging, which preserves inhibitory synaptic transmission, to demonstrate that somatostatin-positive interneurons form densely convergent connections onto pyramidal cells in layer 2/3 of mouse frontal cortex. © 2011 Elsevier Inc.
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