- The TRUGENE HIV-1 resistance report indicates resistance or possible resistance to the study reverse transcriptase inhibitor(s) [RTI(s)] (efavirenz, lamivudine or zidovudine) OR the presence of any mutation in the protease gene leading to an amino acid substitution at the following loci: 8, 30, 32, 46, 47, 48, 50, 54, 82, 84, or 90 OR four or more mutations at the following loci: 10, 20, 24, 36, 53, 63, or 71.