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Sequence characteristics of boxes A and B. Shown are the aligned sequences of the eight isolates; sequence variation among the isolates is indicated in parentheses. Stem-loop structures are indicated by arrows, and the putative promoter region of eltA is marked by underlining. The A box ends with bp 236 immediately before initiator codon ATG of subunit eltA. The B box starts with bp 1 immediately downstream of stop codon TAG.
