BBC News - Bacteria in mouse gut affect development and behaviour
The teeming trillions of bacteria in the digestive tracts of mice have been shown to affect the animals' brain development and behaviour.
Mice bred in sterile environments without these "gut flora" were seen to be more adventurous and less anxious than mice with normal gut flora.
The research adds weight to the idea that gut bacteria are a critical part of the overall development of mammals.
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