Stentor coeruleus exhibits negative phototaxis to visible light, in addition to a step‐up photophobic response. The negative phototaxis was established by demonstrating the swimming of Stentor toward a focused beam away from the light source. The action spectrum showed a maximum at 610–620 nm and is essentially identical to that of the step‐up photophobic response. Proton uncouplers such as micromolar concentrations of FCCP and TPMP + inhibited the negative phototaxis.
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Song et al. (1980) studied this question.
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