For the ex vivo data, IHC staining was performed on 10 μm thick canine retinal cryosections that were incubated overnight at +4°C in the presence of rabbit polyclonal anti-canine CNGA3 antibody (courtesy of A. Komáromy, Michigan State University) at a concentration of 1:750. Primary antibody was visualized with Alexa Fluor 568nm goat anti-rabbit secondary antibody and cell nuclei were stained with DAPI. Slides were mounted (Gelvatol, Sigma-Aldrich) and examined by epifluorescence (Axioplan; Carl Zeiss Meditec) or confocal (Leica SP5-II, Leica) microscopy using previously published methods [31 (link)].
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