Immunohistochemistry was generally performed as described previously [51 (link)] with an additional tissue section digestion by Proteinase K (50 µg/mL; Sigma-Aldrich P 6556) for 10 min. Then the sections were stained using an immunohistochemical staining kit (DakoCytomation Carpinteria, CA, USA, LSAB+ system-HRP, K0679) and either the anti-EGFP-antibody from Abcam (ab290) in a 1:800 dilution or from cell signaling (255S) in a 1:500 dilution.
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