The microbial communities in people's mouths are more closely tied to environmental exposures than to genetics, according to a study published online in Genome Research. A University of Colorado, Boulder, team performed 16S ribosomal RNA sequencing on spit samples from more than 100 individuals, each of whom was tested up to three times over the course of a decade. Among the participants were 27 identical- and 18 non-identical twin pairs.

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