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Epidermal growth factor receptor immunohistochemistry, EGFR, and Chr-7 SISH in colorectal cancer and normal colorectal tissues. Epidermal growth factor receptor IHC with clones 5B7 (A) and 3C6 (B). EGFR SISH revealing gene clusters (C) and the corresponding Chr-7 SISH (D). EGFR SISH with GCN ⩾4.0 (E) and the corresponding Chr-7 SISH (F). EGFR SISH (G) and Chr-7 SISH (H) in normal colorectal tissue. Scale bar 0.05 mm (A, B), 0.02 mm (C–H).
