Fig. 1. Time schedule of the experiment. Animals were put into dishes at 16:00 h on the day before sampling. Sampling began at 10:00 h and consisted of pre-treatment periods A and B, magnetic treatment periods C and D and post-treatment periods E and F. Magnetic treatment was designed as nine pulses (5 min each) periodically shifting the horizontal vector of geomagnetic field (MF) by 60° clockwise (CW).