Alignment of the HIV-1 gp160.

The V3 region and CHR sequences of the different CRFs and subtype B′ were highly polymorphic, compared to the B′ subtype. The NHR sequences were relatively conserved. HXB2-LAI-IIIB-BRU (Acc K03455), CN.97, C54, CN.97.97CNGX_6F, CM240_ACC_U54772 and RL42 were used as reference sequences.



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