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The olfactory system in C. floridanus minor and major workers. Minor and major workers (left) can be distinguished based on their gross morphological characteristics. Minors have a smaller body size whereas majors are larger and possess a shovel-shaped head. The initial site of olfactory signal transduction occurs in the hair-like sensory sensilla distributed across olfactory appendages such as the antennae (center) where odorants encounter one of three different chemoreceptor family members: ORs, GRs, and Irs (right)

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