When we take the microbes from an obese mouse and transplant them into a genetically normal mouse that's been raised in a bubble with no microbes of its own, it becomes fatter than if it got them  from a regular mouse.
Cando collemos os microbios dun rato obeso e llos transplantamos  a un rato xeneticamente normal, criado nunha burbulla, sen microbios propios, engorda máis que se os recibira dun rato normal.