FIGURE 2.

Expression of ORs in the maxillary palp of the migratory locust L. migratoria. In situ hybridizations were performed on sections of the maxillary palp with DIG-labeled antisense probes and sense probes. Signals were visualized using an anti-DIG antibody and color substrates. (A–D) ORNs expressing OR17 (A), OR19 (B), OR21 (C), and OR22 (D) were labeled. The black arrow indicates a cell expressing ORs. (A′–D′) No neurons were labeled by sense probes of OR17 (A′), OR19 (B’), OR21 (C′), and OR22 (D′). Scale bars: 50 μm.