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Area of positive staining revealed by immunohistochemistry in IPMN. Positive staining of the periductal stroma with anti–α-SMA (A), antiperiostin (B), and antigalectin-1 (C) at a magnification of ×200. Positive staining of the acinar area with anti–α-SMA (D), antiperiostin (E), and antigalectin-1 (F) at a magnification of ×100.
