... contain a thymidine analog, if possible In vitro data suggest that K65R antagonizes primer unblocking, the main mechanism of resistance to thymidine analogs.[18] As a result, the thymidine analogs ... 27 Ruane P, Mendonca J, Timerman A, et al.: Kaletra vs nelfinavir in antiretroviral- naive subjects: Week 60 comparison in a phase III, blinded, randomized clinical trial Program and abstracts ... Staszewski S, Keiser P, Montaner J, et al.: Abacavir-lamivudinezidovudine vs indinavir-lamivudine-zidovudine in antiretroviral- naive HIV-infected adults: A randomized equivalence trial JAMA 2001, 285:1155-1163...