Phylogenetic tree, conserved gene context and multiple alignment of L33 ribosomal proteins. Designations are as in Figure 1. Gene name abbreviations: EF-Tu, elongation factor EF-Tu; secE, preprotein translocase secE subunit; L28, L33, S14, S18, ribosomal proteins. A partial multiple alignment of L33 protein sequences is shown on the right (the complete multiple alignment used for tree construction contained 58 positions). The sequence of UU579a was translated from the complete genome sequence of Ureaplasma urealyticum using the TBLASTN program .