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Comparative genomic organization of the tcb locus in the different Photorhabdus strains W14 and TT01. Note that the tcbA gene is deleted from the equivalent location in the genome of TT01 and is replaced by a transposase gene, which is potentially implicated in its excision. See the key in Fig. 3. Sequences are from GenBank accession no. AF346498 and World Intellectual Property 02/094867.
