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Lateral gene transfer and ancient paralogy of operons containing redundant copies of tryptophan-pathway genes in Xylella species and in heterocystous cyanobacteria

Gary Xie, Carol A Bonner, Tom Brettin, Raphael Gottardo, Nemat O Keyhani* and Roy A Jensen

Genome Biology 2003, 4:R14 doi:10.1186/gb-2003-4-2-r14

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