Tissue samples were fixed and paraffinized as described25 (link). The 4 μm thick sections were prepared from paraffin-embedded tissues and immunostained with anti-CD45 (X16/99, Novocastra, Leica biosystems, Newcastle, UK, Cat# NCL-L-LCA), anti-Notch3 (Santa Cruz Biotechnology, Dallas, TX, USA, Cat#5539) or anti-CHOP (Cell Signalling, Danvers, MA, USA, Cat#2895) antibodies. After washes, secondary biotinylated antibodies were applied. Binding of antibodies was detected with the Mouse to Mouse HRP (DAB) Staining System (Scytek Laboratories, Inc., Logan, UT, USA) according to the manufacturer’s protocol. The analysis was conducted blindly.
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