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Fig. 1. Examples of recordings from the lateral galeal sensillum. (A) Three recordings illustrate the normal response of the pyrrolizidine alkaloid (PA) cell to 10-7 mol l-1 seneciphylline N-oxide. (B) Three recordings of normal responses to the electrolyte alone, showing principally the response of a salt cell. (C) Six recordings to show the lack of response to 10-7 mol l-1 seneciphylline N-oxide after recent feeding on Senecio longilobus. First 500 ms shown.