FIG. 4.

Phylogenetic cluster diagram based on urease protein sequence alignment. Ure protein sequences for 51 bacterial species were concatenated in the order UreDABCEFG and aligned. The species having a proline at amino acid position 38 in UreD (numbering according to EHEC UreD) are shown in blue font, and those with a proline at position 205 in UreD are shown with a broken line. The gene orders within the ure gene clusters are designated in the lower left and upper right corners and are distinguished by the yellow and blue backgrounds.