The sections were incubated with p53 polyclonal antibody (ABclonal, Woburn, MA, USA, Catalog No. A3185; 1:100 dilution) or caspase-3 monoclonal antibody (GeneTex, Irvine, CA, USA, Catalog No. GTX30246; 1:200 dilution). After washing with PBS, the slides were incubated with a horseradish...