Body & Brain

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HIV infecting an immune cell

POPPING PILLS  Taking antiviral drugs before and after sex can protect people from acquiring HIV, shown here as particles infecting a human immune cell.

mouse reacting to bitter water

SENSORY DELUSION  By creating a bitter perception by tweaking nerve cell behavior in this mouse, scientists show that taste perception lies in the brain.

E. coli K12 bacterium

LOSS OF APPETITE  Experiments show that helpful gut bacteria like this E. coli K12 produce proteins that could influence the appetite of mice and rats.

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