For instance, CD127hi cells also express high levels of CD27, which is a member of tumor necrosis factor receptor (TNF-R) family and the chemokine receptor, CXCR3, but these cells are found to have low expression of CD43 after infection with the Sendai virus (Kaech et al., 2003; Hikono et al., 2007). This evidence concerns the gene CXCR3 and infection.