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Overview of O. vulgaris olfactory organ. (A) Entry to mantle cavity of a young O. vulgaris in its natural environment: the arrow indicates the position of the olfactory organ and the direction of water flow. (B) Magnification of the olfactory organ in relaxed position. (C) Magnification of the erect olfactory organ when extended out of the olfactory pit. Scale bar=1000 µm.
