JEB -- Wood and Hennessey 206 (3): 627 Figure IG1

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Fig. 1. Transfer of Paramecium to ß, ${gamma}$ -methylene ATP (met-ATP) causes immediate avoiding reactions (AR). Digital video imaging shows the swimming path of a cell to be relatively straight in the control solution (A), while a different cell in 25 µmol l^-1 ß, ${gamma}$ -methylene ATP shows repetitive jerking back and forth, indicative of AR (B). The video capture rate was approximately 16 frames s^-1. (C) The percentage of cells showing AR (% AR) increased in a concentration-dependent manner, with 100% of the cells showing AR at concentrations of ß, ${gamma}$ -methylene ATP above 25 µmol l^-1 and an EC₅₀ of approximately 12 µmol l^-1. Each point represents the mean ± S.D. of three trials.