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Fig. 5. Reaction of the workers' antennae to different odour samples (expressed as proportions of the total reaction, N=16 for each odour). Air, filter paper without odour; solvent, pentane, 10 ng, 100 ng and 1000 ng, pentane solutions of synthetic 3,11-diMeC27, P. inv, cuticular extract of P. inversa. The response is significantly different (Friedman RM-ANOVA: Fr=16.42; P=0.006. *Significant differences (P<0.05), Wilcoxon test).