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DNA sequence at the deletion junction. Sequences of nef clones, 5′LTR deletion clones (consensus) and the LD-PCR product (LD) are compared with the corresponding sequence of HIV-1 NL4-3. The direct repeats CCAA are underlined. The numbers underneath the nef and 5′LTR deletion clones refer to the frequency of the repeats among them. nt, nucleotides.
