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Why our colons are happy homes for bacteria

Biologists have figured out how it’s possible for some beneficial gut bacteria to reside and thrive in the ever-changing gastrointestinal tract.

The human body is full of tiny microorganisms—hundreds to thousands of species of bacteria collectively called the microbiome—which are believed to contribute to a healthy existence.

The gastrointestinal (GI) tract—and the colon in particular—is home to the largest concentration and highest diversity of bacterial species. But how do these organisms persist and thrive in a system that is constantly in flux due to foods and fluids moving through it?

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