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(a1, a2, a3) Negative control peptide: Immunohistochemistry (IHC) staining of the prostate tissue with a peptide Biotin-EHFRW that does not bind to hPSA epitope RHSLFHP. (b1, b2, b3) Negative control antibody―prostate tissue: IHC staining with CD20 (L26) monoclonal antibody; only inflammatory cells are stained. (c1, c2, c3) Negative control tissue―liver tissue: IHC staining with the antisense paratope Biotin-AVRDKVG that binds to hPSA epitope RHSLFHP. Scale bar = 0.5 mm.
