Anti-HIV Agents|Base Sequence|DNA, Viral|Dideoxynucleotides|Drug Resistance, Viral|HIV Infections|HIV Reverse Transcriptase|HIV-1|Humans|Kinetics|Models, Molecular|Molecular Sequence Data|Mutation|Nucleosides|RNA, Viral|Reverse Transcriptase Inhibitors|Thymine Nucleotides|Zidovudine|pol Gene Products, Human Immunodeficiency Virus