Nevertheless, the indicator cell line transduced with CD134 that was selected for use in this study displayed a pattern of susceptibility to infection consistent with that of the MYA-1 cell line, an IL-2-dependent, CD4+ feline T cell line expressing CD134 and CXCR4 that has been utilized previously in neutralization assays (Hosie et al., 2011). This evidence concerns the gene CXCR4 and infection.