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Key points from article :
H7N9 strain has infected over 900 people since 2013.
Small mutations in three amino acids found on the flu virus surface would make it better at binding to human cells.
US safety regulations prohibit introducing these mutations to actual H7N9 viruses.
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Imperial College London senior lecturer and scientist researching respiratory immunology.
Journal covering research on pathogens and how they interact with their host organisms.
Specialized agency of the United Nations responsible for international public health
