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Concordance of duplicate tropism determinations. Two replicates of 46 plasma samples were evaluated in the Trofile assay. The infectivities (luciferase activities) of paired replicates on CCR5+/CD4+/U87 cells (crosses) and CXCR4+/CD4+/U87 cells (circles) were graphed pairwise to demonstrate the concordance between measurements.
