Researchers report in Cell this week the genome sequence of Naegleria gruberi, an amoeba capable of shifting among three distinct morphological identities. Naegleria usually subsists as a common solid amoeba; under stress it generates two flagella for motility; further still, it can persist as a “hard cyst” in soil until moisture permits its return to its amoeba form.

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The apple has traveled westward and eastward along the Silk Road, according to a new genetic analysis.

In Nature this week: GWAS data used to reposition drugs for psychiatric use, and more.

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