TABLE 1.

Relative thickness of cortical layers.

Cortical area	MZ	CP	L5	L6	SP
M1	0.079	0.215	0.276	0.320	0.107
S1Bf	0.070	0.245	0.301	0.263	0.088
S2	0.112	0.218	0.273	0.867	0.132

Layer boundaries were assigned on 12 μm thick coronal sections, stained for DAPI and NeuN in M1, S1Bf and S2 (Supplementary Figure 2). Relative layer thickness data were used for total neuron number estimations in each layer (Table 2) and for assigning the backlabeled cells to layers.