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The 16S rDNA encoding the small subunit ribosomal RNA were amplified by PCR, cloned, and sequenced from 16 strains of Xylella fastidiosa originating from nine different hosts. In pair-wise comparisons, X. fastidiosa strains showed a maximum variation of 1.0% or 14 nucleotide positions. When all 16 sequences were considered as a set, 54 variable positions were found. Analysis of the sequence data indicated...
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