Figure 3. Schematic representation of common chimeric HIV/SIV strains used in vaccine research. The information was obtained from the references shown in the figure. Although every attempt was made to contact the authors to clarify ambiguities, in some cases the exact location of the borders between HIV and SIV could not be established. The uncertain regions are shown in gray. The HIV genes used in these constructs are from the clones HXB2, 89.6, SF33 and DH12.