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A: Neighbor-joining tree of B derived fragment (covering from nt 3400 to nt 4800 HXB2) of 4 new 01B full-length sequences (46,59,73,115). Triangle represents 4 New Recombinant strains; Black and bold branches represent MSM strains formed branch. B: Neighbor-joining tree of CRF01_AE derived fragment (covering from nt 790 to nt 2292 HXB2) of these 4 new 01B sequences.
