Figure 3: Rotation of three isolated frog rod outer segments (visual photoreceptors) of comparable sizes suspended in water (Ringer′s solution) under the influence of a homogeneous magnetic field of 10,000 Gauss (the Earth’s magnetic field is about 0.5 Gauss). A. Original data are displayed as orientation angle θ vs. time in second. B. The same data are displayed as ln tan θ vs. time. (A. Reproduced from [120]; B. Reproduced from [121]).