Abc hrp and dab kits

Tissue samples were fixed in 4% paraformaldehyde (EMS) at room temperature for 45 minutes, followed by an overnight incubation in 30% weight/volume sucrose solution (Sigma-Aldrich). Samples were then embedded in optimal cutting temperature (Tissue-Tek) and frozen on dry ice. Staining was performed on 10-μm sections by first blocking with 5% donkey serum and 0.1% Tween-20 for 1 hour, followed by overnight incubation with primary antibody diluted in blocking buffer in a humidified chamber. Sections were washed three times in PBS containing 0.1% Tween-20. For immunofluorescence staining, slides were then incubated with DAPI (Life Technologies, 1:1,000) and Alexa fluorophore–conjugated antibodies (Jackson ImmunoResearch). For IHC, slides were first incubated with biotinylated secondary antibodies (Jackson ImmunoResearch) and developed using the ABC HRP and DAB kits per manufacturer protocols (Vectorlabs). Primary antibodies used were as follows: rat anti–Ki-67 (eBioscience, 14–5698–82), rabbit anti–c-Myc (Y69; Abcam, Ab32072), rabbit anti-CD3 (Invitrogen, PA1–29547), rabbit anti-F4/80 (Novus, NBP2–12506), rat antineutrophil (Abcam, NIMP_R14), anti-CD206 (R&D Systems, AF2535), and rabbit anti-Arg1 (Cell Signaling Technology, 93668).