Phylogenetic Tree of 19 Ureaplasma Strains Based on 82 Housekeeping Genes. ATCC type strains are labeled with tree letters (species) followed by a number (serovar). UUR = Ureaplasma urealyticum; UPA = Ureaplasma parvum; ntUPA3 = clinical isolate sequenced in 2000; 2033, 2608, 4155, and 4318 are clinical isolates of Ureaplasma urealyticum that cannot be serotyped. The tree is based on the concatenated alignment of 82 housekeeping genes 16 tRNA ligase genes, 12 DNA and RNA polymerase genes, 47 ribosomal protein genes, and the 7 urease subunit genes). The non- informative positions were removed from the alignments. The removal of the non- nformative positions increased the bootstrap values.