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Relationship between gene divergence and intraspecies variability. The distributions of MD and HD genes (white squares and black circles, respectively) show little overlap. MD genes tended to be variable in small numbers of strains (n = 269, mean = 4.0, standard deviation = 6.3), whereas HD genes displayed high degrees of intraspecies variability (n = 122, mean = 26.5, standard deviation = 15.9).
