Nurture trumps nature in a longitudinal survey of salivary bacterial communities in twins from early adolescence to early adulthood.

However, if we compare both MZ and DZ pairs to unrelated individuals who live in different homes at the same age, the difference becomes highly significant.

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We observed a slight trend toward more similarity among cohabiting MZ pairs than DZ pairs ( Fig. 3 ), but as previously shown in the gut ( Turnbaugh et al. 2009 ), this difference was not statistically significant.

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