Five micron formalin-fixed, paraffin embedded sections were cut for immunostaining and analyzed as previously described [63 (link)]. IHC staining was performed at the Pathology Research Core (Mayo Clinic, Rochester, MN) using the Leica Bond RX stainer (Leica). Briefly, tissue slides were dewaxed and retrieved on-line using the following reagents Bond Dewax (Leica) and Epitope Retrieval 2, EDTA based (Leica Biosystems Inc. Buffalo Grove, IL). Tissue slides were retrieved for 30 minutes. The ERβ1 PPG5/10 antibody (Thermo Scientific, Waltham, MA) was diluted 1:75 in Background Reducing Antibody Diluent (Dako, Agilent Technologies, Santa Clara, CA) and incubated for 30 minutes. This antibody has been shown to be highly specific and sensitive for detection of only the full-length form of this receptor in previous IHC studies [59 (link)-61 (link)].
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