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Pleurobranchaea maculata gonad/digestive tissue sectioned at 10 μm. (A) Tetrodotoxin (TTX)-specific monoclonal antibody (mAB) immunohistological staining (TTX identified by the brown color deposits); (B) Hematoxylin and Eosin staining; and (C) mAB negative control. dg = digestive gland, oc = oocyte. Black bars = 200 μm.
