Fig. 4.

Gr64a was required for sucrose-, glucose-, and maltose-induced action potentials. Tip recordings were performed on L4 sensilla of the indicated genotypes. (A) Recording electrode (arrow) placed over an l type bristle (arrowhead). (B) Sample tip recordings using 50 mM sucrose. (C–F) Average frequencies of action potentials (spikes per second) in response to the indicated sugars. The averages were based on data collected between 50 msec and 1,050 msec after application of the sugars (n = 5–7). Statistically significant differences between the indicated pairs of data were checked by using the unpaired Student t test (*, P < 0.05; **, P < 0.01).