How do fish make electricity? - Eleanor Nelsen
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Electrocytes are modified muscle. Scientists at the University of Wisconsin have studied the genetics behind the transition from muscle cells to electricity-producing cells, and discovered that this remarkable ability evolved six different times.
Centuries before the invention of anesthesia or modern painkillers, physicians who happened to live near the habitats of strongly electric fish employed their shocks as analgesia. The Romans used the electric torpedo ray to treat headaches and gout, and the Greeks used them during childbirth (in fact, the English word “narcotic” is derived from narke, the Greek word for these rays).
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