The human gut is awash in a sea of microbes that quietly ferment fibers, produce vitamins, and exchange information with the immune system.1 Now, scientists are tasking bacteria with yet another job as they spelunk their way through the digestive system: cancer detection. 

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[The Scientist, 2023.11.1, https://www.the-scientist.com/news/biosensors-for-colorectal-cancer-71461]