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Maximum likelihood analysis of congruence in H. influenzae. The ML tree of each locus is compared with the ML trees from the other four loci. The differences in likelihood (Δ-ln L) are shown between loci (squares) and between each locus and 200 trees of random topology (diamonds). The 99th percentile of the likelihood differences between the ML tree for each gene and the 200 random tree topologies is indicated by the dotted line.
