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Robustness in gene networks of influenza A HA genes. Phenotypes are genetically robust, allowing genotypes to drift through genotypic neutral space before instant shifts in phenotype. Such a scenario is a demonstration, from the actual epidemiological literature, of how genetic robustness can facilitate evolvability in infectious disease agents. [From E. van Nimwegen, Science 314, 1884, 2006. Reprinted with permission from AAAS.]
