Fig. 3. Growth in caterpillars lacking their lateral, medial and epipharyngeal sensilla on (A) the salicin versus salicin control diets or (B) the aristolochic acid (Aristo. acid) versus aristolochic acid control diets. We monitored growth directly by determining the percentage increase in mass that occurred over two successive 24 h exposure periods. In each panel, we compare the percentage increase in mass between caterpillars maintained on either diet after 24 and then 48 h of exposure using the Mann–Whitney U-test (*P0.025). All values are median ± median absolute deviation (N=10–11 per treatment group). The concentrations of aristolochic acid and salicin in the diets are as in Fig. 1.