IHC was performed as previously described95. Briefly, 5μm thick paraffin-embedded sections of tumor tissue excised from GemOE orthotopic mammary tumors were deparaffinized, rehydrated, and washed in PBS. Antigen retrieval for all antibodies was done using Sodium citrate buffer (10 mM Sodium citrate, 0.05% Tween 20, pH 6.0), 10 min at 95 °C. Slides were blocked with 10% normal serum (2° antibody species) for 1 h at RT, washed, and probed with 1° antibodies overnight at 4 °C. Slides were exposed to Alexa Fluor 568 (red), and 488 (green) conjugated secondary antibody for 1 h at RT and counterstained and mounted with VECTASHIELD mounting medium with DAPI (Vector) and imaged under the fluorescence microscope.
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