Fig. 6. Relative differences in the amounts of 12 chemicals in the brains and thoracic ganglia of second generation solitarious and long-term gregarious adult locusts. Values are standardized to give a mean gregarious value of 1; the grey bars indicate ± S.E.M. of the gregarious values. The circles shown the mean multiple of the gregarious value found in second-generation isolated locusts (± S.E.M.). Asterisks indicate significance of post hoc comparisons, as detailed in Table 2. NS, not significant.