ACP rhinarial plate and odor sensitivity.

(a) Left: Scanning electron micrograph of a rhinarial plate sensillum (arrow). Middle: Schematic of rhinarial plate cross section, showing three ORNs housed in a pit-like structure. Right: Representative action potential traces from a RP4 sensillum showing (top) spontaneous activity with spike amplitudes A, B, and C neurons marked, and (bottom) during a 0.5 sec stimulus with isobutyl acetate (10−2) indicated with a line. (b) Graphs depicting mean ORN responses to 61 odorants that activate and/or inhibit at least one rhinarial plate ORN at 10−2, 10−3, and 10−4 dilution (spikes/sec). N = 3 per stimulus. (c) Dose-response curves. Chemical volatiles were screened at five different concentrations (10−2 to 10−6) against specific RP-ORNs. n = 3. Error bars: SEM.