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(A) CK7 membranous immunoreactivity in duct-like structure (IHC, 20×). (B) Synaptophysin immunoreactivity in neuroendocrine cells (IHC, 20×). (C) Chromogranin immunoreactivity in neuroendocrine cells (IHC, 10×). (D) E-cadherin showing strong membranous immunoreactivity in ductal structure and weak in neuroendocrine cells (IHC, 10×). IHC, Immmunohistochemistry.
