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Rather than getting a gene for its original function, a horizontal gene transfer provides the raw material for evolutionary innovation.

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Drug-free environments, such as a designated ward in a hospital, might reduce the strength of selection for resistance.

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image: Human Brain Organoids Thrive in Mouse Brains

Human Brain Organoids Thrive in Mouse Brains

By Ashley Yeager | April 16, 2018

After implantation, the tissue developed blood vessels and became integrated into neuronal networks in the animals’ brains.

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This is the first time the precise brain cells and their connections controlling a complex behavior have been worked out. 

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Authors of a new study suggest that 520-million-year-old structures, previously identified as the brains of ancient arthropods, are instead preserved microbial biofilms.

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Researchers identified thousands of immature neurons in the brain region, countering a recent result showing little, if any, signs of neurogenesis.

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image: Frogs Fight Back From Fungal Attack

Frogs Fight Back From Fungal Attack

By Ruth Williams | March 29, 2018

A decade after chytridiomycosis killed scores of amphibians in Panama, some species are recovering. New research indicates why.  

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image: Monitoring Mutations with Microfluidics

Monitoring Mutations with Microfluidics

By Ruth Williams | March 15, 2018

A device dubbed the “mother machine” enables real-time observation of mutagenesis in single bacterial cells.  

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The finding suggests corvids may have an innate sense of number.

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Host slugs given Prozac to increase their serotonin levels no longer avoid parasitic nematodes, the same behavior seen in infected slugs.

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