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Phylogenetic tree showing the relationships of the amino acid sequences of the mef genes of the four Streptococcus-like gram-positive cocci (highlighted in bold) to those of other mef genes. The tree was inferred from the 318-amino-acid sequence data by the neighbor-joining method. The scale bar indicates the estimated number of substitutions per 50 amino acids using the Kimura correction. Names and accession numbers are given as cited in the GenBank database.
