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(a) Distribution of inter-subtype recombination breakpoints divided into 300 bp bins in A1/D recombinants (n = 164) and all other inter-subtype recombinant genomes (n = 68). Genome position numbering corresponds to the alignment as described in Section 2. (b) Distribution of breakpoints in the envelope region. Breakpoints have been binned into 100 bp regions and the finer sub-structure of gp120 and gp41 is shown.
