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Organization of the ORFs of IS1601-L and the positions of the DRs and IRs that define parts A (green), B (blue), and C (red). The two copies of DR1 (shown in black) are found only in the left IS1601 (IS1601-L) shown in Fig. 1 and are not included in the 4,262-nucleotide (nt) position numbering.
