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Unrooted maximum-likelihood phylogenetic tree of partial (389 nt) phzF DNA sequences obtained from representative strains featured in this (n = 76) and previous (n = 37) (1, 5) studies, as well as from samples of rhizosphere DNA (n = 454). The total number of clones within the cluster (n) or subcluster (n′) specific to each geographic site is indicated. A representative strain from the MLSA analysis is also shown for each cluster.
