isolators where there are absolutely no bacteria so they've lived without microbiota since birth. in this experiment the pastor institute team is prepared another group of mice born and raised in normal conditions that is to say in contact with microbes. the scientists compared the two groups. the principle of this test is to measure their level of anxiety. we placed a mouse in the center of this intersection composed of two paths with no walls open all around. to pass with walls the mouse faces a dilemma because naturally being a curious animal it tends to want to explore the open paths but that creates anxiety so it's more reassuring to be in the closed paths with was seventy i think . and the result is surprising that two groups