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Phylogenetic trees of the C-terminal autotransporter (AT-2) domains (A) and the N-terminal passenger domains (B) of the same proteins. The clusters (1a to d, 2a to d, and 3a to d in A and 1 to 28 in B), analyzed for sequence conservation (see text), are indicated in the figure. The trees are based on the CLUSTAL X-derived multiple alignments shown in Fig. 1. The trees were drawn with the TreeView program (55).
