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The Evros — called the Meric River in Turkey — runs through one of the remotest parts of Europe.

They had entered the country using plastic boats to cross the Evros River — known as Meric in Turkey — which forms a border between the two countries.

Méric and his colleagues combed the data for clues to how a person’s diet and genetics affect the microbiome.

Méric’s team also explored which genetic variants might affect the abundance of certain microbes—and which of those variants were linked to 46 common diseases.

“The beauty of the work,” he adds, is that Méric and colleagues made the connection between increased levels of the bacterium and patients undergoing depression.