NEW YORK (GenomeWeb News) – Dental disease-causing bacteria rose through the ranks of mouth microbiomes as humans transitioned from hunter-gather diets to a diet centered around agriculture and again, more recently, as human diets began including processed foods, according to a new Nature Genetics study.

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In PNAS this week: genomic study of group B Streptococcus evolution, selection on the X chromosome in great apes, and more.

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