&NA; Monitoring microbes that live deep inside the gut is a challenge. Engineering bacteria to express structures that can be tracked by ultrasound offers a way to locate such cells… Click to show full abstract
&NA; Monitoring microbes that live deep inside the gut is a challenge. Engineering bacteria to express structures that can be tracked by ultrasound offers a way to locate such cells in vivo, and might have clinical implications. See Letter p.86
               
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