Acting in the right place at the right time is the key to effective medical treatment with minimal side effects. However, this feat remains difficult to achieve. Biologists and chemists have now succeeded in developing a tool that controls the location at which a molecule is activated by a simple pulse of light lasting only a few seconds. Tested on a protein essential for cell division, this system could be applied to other molecules. The potential applications are vast, both in basic research and in improving existing medical treatments, such as those for skin cancer.
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