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UPGMA tree constructed by the Geneious tree builder (software verion 4.8) on the basis of a multiple protein alignment of 18 receptor binding proteins (homologs of phiP68-encoded ORF17) present in the genomes of S. aureus phages belonging to the Podoviridae family. The position of the receptor binding protein encoded by the phage EB1 is marked by a dot.
