A, Histogram of synaptic targets of boutons in layer 1 (n = 30), layers 2 and 3 (n = 64), layer 4 (n = 39), and layer 6 (n = 29) of area V1 originating from neurons labeled in the ipsilateral claustrum. B, Histogram of the distributions of postsynaptic areas (μm2) formed by labeled claustral boutons in layer 1 (n = 31) and layers 2 and 3 (n = 31) of ipsilateral area 17.