Andrew Huberman· PhD
As you move down out of the stomach, into the small intestine, you start to see these communities, which are the ones that are becoming more well-studied. Small intestine is still a bit of a black box, just because it's hard to access. And so there's some really cool technologies out there for using, for instance, capsules to do sampling as the capsule passes through the digestive tract, so that we have a better idea of what's going on in the small intestine.