Tissue specimens from mice were formalin-fixed then subjected to IHC staining as described previously [27 (link),34 (link)]. Briefly, the tissue sections were de-waxed and rehydrated. The sections were stained with monoclonal antibodies against cleaved PARP and cleaved caspase3 (Cell Signaling) for 24 h at 4°C. After washing, the samples were probed with peroxidase-labeled goat anti-rabbit secondary antibody (Epitomics, Burlinggame, CA) and detected with an ABC kit (Vector Laboratories, Burlingame, CA).
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