Fig. 3.

Acidic pH avoidance behavior of wild-type C. elegans on shallow acidic pH gradients. a The pH gradient measured from excised agar fragments from the assay plate. b Relationship between the angle of encounter and behavioral maneuvers. From left to right, results from relatively steep to shallow gradients depicted in (a) were shown. c The ratio of behavioral choice. Data were represented as in Fig. 2a, b. Results from 0 to 10 degrees bin were shaded in (c) because of the low number of avoidance events less than 15. The ratio of reversal had a positive correlation with the angle in all conditions (R > 0.9, p < 0.01)