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During early development (1st instar nymph) a distinct OR type is only expressed in relatively few cells in basiconic sensilla. In A–B’ cells expressing distinct OR types and Orco were visualized by means of two-color FISH using specific antisense riboprobes. The analyses of 10 μm optical stacks from sections of 1st instar nymph antennae revealed only two patterns OR expression: solitary cells or cell pairs. White dash circles outline distinct OR cells. Scale bars, 10 μm.
