Figure 1From: Evolution of the uniquely adaptable lentiviral envelope in a natural reservoir hostViral load quantification for five naturally infected sooty mangabeys. Viral RNA in plasma obtained in 3/99, 5/99, and 5/01 was measured by a real-time RT-PCR assay designed to quantitatively detect the diverse SIVsm variants (viral RNA copies/mL).Back to article page