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Pleurobranchaea maculata mantle tissue sectioned at 10 μm. Red arrows indicate tetrodotoxin (TTX) containing cells. (A) TTX-specific monoclonal antibody (mAB) immunohistological staining (TTX identified by the brown color deposits); (B) Hematoxylin and Eosin staining; (C) Alcian Blue-Periodic Acid Schiff staining and; (D) mAB negative control. Black bars = 100 μm.
