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The flu has many faces

The N1 subtype of neuraminidase, an enzyme found in influenza viruses, can take on 27 shapes (shown), a new study reveals — a flexibility that can stump some antiviral drugs. Loop regions, shown in brown/gray, can twist into many more shapes than other parts of the enzyme (green and white) can. Credit: Daniel Dadon and Jacob Durrant, University of California, San Diego

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