A gut's complex architecture, recreated on a microscope slide–sized chip
Gut instinct, gut feeling or gutting it out—what exactly is the human gut? It's the workhorse of the digestive system and home to a vast, dynamic community of microorganisms that influence human health. In fact, the human body contains roughly equal numbers of nonhuman (microbial) and human cells.

<p>Gut instinct, gut feeling or gutting it out—what exactly is the human gut? It's the workhorse of the digestive system and home to a vast, dynamic community of microorganisms that influence human health. In fact, the human body contains roughly equal numbers of nonhuman (microbial) and human cells.</p>