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Maximum likelihood phylogeny showing relationship among lacGEFDCBA genes from the Lac.2 operon for 44 S. agalactiae strains and 16 additional Streptococcus species.S. agalactiae strains are labeled using their 4-letter accession prefix. See Additional file 1 for cross reference to all strain names. Four major S. agalactiae groups are shaded.
