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Fig. 5. Effects of rearing on diet containing low concentration of monocrotaline. (A) Response of pyrrolizidine alkaloid (PA) cells in the lateral galeal sensillum to 10-7 mol l-1 seneciphylline N-oxide after 24 h of exposure to synthetic diets containing different concentrations of monocrotaline. Only those individuals that responded in a typical manner are shown. (B) Percentage of insects in each category in which sensory shutoff of the PA cell was observed (% less than 10 spikes). (C) Numbers of fecal pellets produced in the 24-h test feeding period. Bars represent means, and vertical lines represent S.E.M.