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Fig. 9. Responses of cells other than the pyrrolizidine alkaloid (PA) cell in the lateral galeal sensillum in various insects with or without a sensory shutoff in the PA cell in the lateral galeal sensillum. Open symbols represent individuals with no PA response in the lateral sensillum; filled symbols represent individuals with a normal PA response in the lateral sensillum. Asterisks indicate a significant decrease in response by insects whose PA cell in the lateral galeal sensillum is non-responsive.