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α7 nAChR mRNA distribution in the developing retina. (A,B) Bright- and dark-field photomicrographs of an E17 retina showing low levels of α7 mRNA expression in the ganglion cell layer. The section was counterstained with cresyl-violet and retinal layers are indicated: GL, ganglion cell layer; NE, neural epithelium; PE, pigment epithelium. (C) Adjacent section showing background labeling with the sense riboprobe. Scale bar = 50 μm.
