Phototactic guidance of a tissue-engineered soft-robotic ray

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        A bio-inspired swimming robot that mimics a ray fish can be guided by light. Park
        <jats:italic>et al.</jats:italic>
        built a 1/10th-scale version of a ray fish with a microfabricated gold skeleton and a rubber body powered by rat heart muscle cells. The cardiomyocytes were genetically engineered to respond to light cues, so that the undulatory movements propelling the robot through water would follow a light source.
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      <jats:p>
        <jats:italic>Science</jats:italic>
        , this issue p.
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