Electrical currents are invisible to the naked eye -- at least they are when they flow through metal cables. In nerve cells, however, scientists are able to make electrical signals visible. Working with fellow experts from Switzerland and Japan, scientists from the Max Planck Institute for Medical Research in Heidelberg successfully used a specialized fluorescent protein to visualize electrical activity in neurons of living mice. In a milestone study, scientists are able to apply the method to watch activity in nerve cells during animal behaviour.
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