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Typical mutation patterns of FhuA clusters in Salmonella and Escherichia. (a) A diagram tree showing the clusters of FhuA determined for Salmonella and Escherichia. (b) List of indels and substitutions and corresponding sequences that are able to distinguish the different FhuA clusters. Indel 1 and indel 2 can distinguish E4 from E1/S1/E2/E3/S2, indels 3 to 6 can distinguish E3/S2 from E1/S1/E2, Sub1 can distinguish E3 from S2, and Sub2 can distinguish S1 from E1.
