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Body & Brain

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illustration of syringe with flu viruses

ONE AND DONE  The flu kills tens of thousands of people in the United States each year, and protection is made harder by the need for an annual shot. A onetime vaccine is getting closer to reality. 

Candida tropicalis

SHAPE SHIFTER  Candida tropicalis usually grows as a harmless roundish budding yeast (green), but in the presence of two bacteria it stretches into long filaments (brown) that may provoke inflammation in intestines.

Schmidtea mediterranea

DANGER DETECTOR  In planarians (Schmidtea mediterranea shown), a protein called TRPA1 detects hydrogen peroxide, a molecule produced when cells are damaged. These new results give hints about the evolution of human pain.

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