Gene region Outer primer, RT-PCRa
Forward Reverse
gp120 5′ TGTGTGGTCCATAGTAATCATAGAATA ′3 5′ CTCAATAGCCCTCAGCAAATT ′3
  5′ CAATTGGAGAAGTGAATTATAT ′3 5′ CTGGCTCAGCTCGTCTCATTC ′3
  Inner primer, Sequencing-PCR
Forward Reverse
gp41 5′ GAAAGAGCAGAAGACAGTGGCAATGA ′3 5′ ATTGGCTCAAAGGATACCTTTGGACA ′3
  5′ CAATATCAGCACAAGCATAAGAGGTAA ′3 5′ TCCTGAGGATTGCTTAAAGATTATTGT ′3
  5′ GGAAATATGAGACAAGCACATTGTAAC ′3 5′ TACCAGACAATAATTGTCTGGCCTGTA ′3
  5′ AAGAGAAGAGTGGTGCAGAGAG ′3 5′ GCCTAACTCTATTCACTATAGA ′3
  5′ TATTGGAATTAGATAAATGGGC ′3 5′ GCCATCCAATCACACTACTT ′3
aReverse transcriptase PCR reaction for generation of cDNA and elongation
Table 1: PCR primers used for sequencing of env gene of HIV-1.
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