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Fig. 7. Disadaptation of the pyrrolizidine alkaloid (PA) cells in the lateral galeal sensillum to 10-7 mol l-1 seneciphylline N-oxide after adaptation using exposure of the sensillum for 10 min to sap of Senecio longilobus. Asterisks indicate a significant decrease from initial level of response (P<0.05). The black square at time zero is the initial firing rate normalized to one.