Recent publications in Radiation Research on the subject of biological effects of power-frequency electromagnetic fields do not provide a full description of the orientation of the electric and the magnetic fields with respect to the petri dish or the specimen that is exposed. Without this description, a meaningful interpretation or a replication of the experiment is not possible. We are led to this comment for two reasons.

The first reason arises from the work of Miyakoshi and colleagues (1, 2). They exposed mammalian cells to very strong magnetic fields perpendicular to the petri dish and measured the frequency of mutations of a particular gene (HPRT) when the cells were exposed to ionizing radiation and to the magnetic field. Both exposures increased the mutation rate. It was seen that the rate for the magnetic-field exposure increased with radius from the center of the dish. With this...

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