(A) Expression of excitatory neuron markers in excitatory communities of neurons four and seven. (B) Expression of known inhibitory neuron markers in the interneuron communities one, two, three, five, and six. (C) Costaining for proteins PVALB and CALB2 in human cortical sections shows expression of the two proteins in distinct populations of cells. Arrows indicate PVALB-positive cells. Images were taken using a 20× objective. (Scale bar, 100 μm.) (D) Costaining for proteins VIP, PVALB, and CALB2 in human cortical sections shows VIP expression in a subset of CALB2 neurons that lack expression of PVALB. (Upper) Images were taken using a 20× objective. The white dashed box shows an area of the tissue imaged at 63×. (Scale bars, 100 μm for the 20× image and 20 μm for the 63× image.) Arrows indicate VIP/CALB2-positive cells that are negative for PVALB.