Mice were perfused transcardially with 4% paraformaldehyde (PFA) for light microscopy. Tissue was extracted and postfixed for up to 4 h at 4℃. Immunohistochemistry was performed on Vibratome (50 µm) sections using standard reagents and the following antibodies: anti-NK1 (1:10,000, Chemicon, Temecula, CA), anti-NeuN (1:500, Millipore).
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