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Sex-specific pheromones are used for communication in non-human mammalian species like rats, and are detected by:the olfactory epitheliumthe dentate gyruspapillaethe vomeronasal organ (VNO)

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Pheromones are mostly detected by sensory neurons in the vomeronasal organ (VNO), a bilateral tubular structure in the anterior region of the nasal cavity.

Answer: the vomeronasal organ (VNO)

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