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Insertion positions of erythromycin cassette in the xep genes. Broken arrows indicate the directions of orientation of the erythromycin cassettes that were inserted. The Institute for Genome Research locus names are indicated in the boxes of the xep genes. PG0539′ and ′PG0540 indicate the C-terminal truncated xepA and the N-terminal truncated xepB, respectively. In X-101, the region between a BalI site in xepA and that in xepB was deleted and an erythromycin cassette was inserted there.
