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Representative IHC of EGFR and ErbB2 receptors in prolactinomas on tissue array (20× magnification). Top corner box shows magnification of selected area. EGFR staining was nuclear and ErbB2 staining membranous/cytoplasmic. Positive control tissue is breast cancer A. EGFR staining of prolactinoma B. EGFR staining of breast cancer (63× magnification). C. ErbB2 staining of prolactinoma D. ErbB2 staining of breast cancer (63× magnification).
