Figure 1From: Quantitative competitive reverse transcription polymerase chain reaction is not a useful method for quantification of CD4 and CD8 cell status during HIV infectionThe relationship between cell counts and the quantity of mRNA as determined by QC-RT-PCR. (A) CD4, and (B) CD8. The HIV status of each sample is depicted. represents HIV positive status, â– represents HIV negative status, and â–² reepresents unknown status.Back to article page