Supplementary Figure 1: Histology.
From: The functional organization of cortical feedback inputs to primary visual cortex
a, Coronal sections of visual cortex showing infection site and labeled axons in V1 from an example mouse (out of 5). b, Blow-up from region in a (white rectangle) showing GCaMP6 expressing axons in V1. c, Confocal image of GCaMP6 expressing axons in L1 of V1. d, Injection site. Right, blow-up of region in L5 (black box).
