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Immunohistochemical staining of BRCA1 in gastric cancer (GC). A and B: Positive BRCA1 expression in GC tissue. C: Positive BRCA1 expression in GC para-tumor tissue. D and E: Negative BRCA1 expression in GC tissue. F: Negative BRCA1 expression in GC para-tumor tissue. Original magnification: ×100 (A and D); ×400 (B, C, E, and F).
