Figure 1From: Asymmetric HIV-1 co-receptor use and replication in CD4+ T lymphocytesHIV-1 replication and co-receptor use in naive, memory and Th subsets. Both Naive and Th2 cells are characterized by high level of CXCR4 expression that is upregulated by IL-4. Memory and Th1 cells show surface levels of CCR5 higher than those of CXCR4, whereas Th17 cells express both Co-R.Back to article page