There is a book, "The Body Electric", by Robert Becker, about his investigations of electromagnetic effects on, mostly, salamanders. During the time he worked,

There is a book, "The Body Electric", by Robert Becker, about his investigations of electromagnetic effects on, mostly, salamanders. During the time he worked, and for long after, such investigation was effectively forbidden in the US, on threat of losing grants and invitation to present at conferences. Becker had a free pass based on a relationship with the US Veterans Administration, which hoped he would be able to find a way to regenerate severed limbs, a topic of some interest. The mode of action he found was orchestration of development and growth by way of sub-nanosecond electric currents. He was able to control healing and regeneration -- turn it off and on -- by applying these small currents in different directions. AC fields, from 60Hz up into microwaves, can be persuaded to induce such currents by modulation. So, with no or with one modulation, exposure may have no effect, but with another you get a pronounced effect. You cannot generalize from one exposure to another, one modulation to another. The effect observed in this study might easily not be replicated in another, according to some apparently trivial variation in their setup.