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Detection of the ASP ORF. Weighted percentages of start (blue) and stop (red) codons in frame −2, in the groups M and out-of-M. The asp region (white area) is located between the env positions 1,717 and 1,151 (HXB2 reference). The red star indicates an early stop codon that is specific to subtype A and A recombinants. This early stop codon is followed by an alternative start codon (blue star) in most of the A sequences and certain A recombinants.
