Figure 1. Viral life cycle of HIV. Reprinted with permission from Macmillan Publishers Ltd: Nature Medicine 2003;9:867–73. Twenty years of therapy for HIV-1 infection. Authors Roger J. Pomerantz and David L. Horn. Nature Medicine adapted the figure from the Journal of Molecular Biology, 1999;285:1–32. Structural Biology of HIV. Authors Brain G. Turner and Michael F. Summers. Reprint permission also granted from Elsevier.