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A WORD on the constraints of influenza virus evolution

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Evolution proceeds by selection of mutants that arise by error-prone duplication of nucleic acid genomes. It is believed that mutations that are selected in a gene are dependent on those that have preceded them, an effect known as epistasis. Analysis of a sequence of changes in the influenza virus nucleoprotein provides clear evidence that stability explains the epistasis observed during evolution of a protein.
 
 

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