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FZ91-30 5′ inverted terminal repeat (ITR) sequences. The numbers above the sequences denote the nucleotide position. The nucleotide differences relative to the FM strain are shaded with grey. The D sequence is composed of 42 nucleotides, which base pairs with the D′ sequence at the 3′ ITR. The sequences in the bubble regions can exist as two different sequences, termed flip and flop, which reversely complement with each other
