FACS analysis determining the ratios of RFP+ cells in GFP+ cells revealed that ZNF506 overexpression significantly reduced pMX-RFP pseudoviral infectivity, compared with WT cells or control cells overexpressing ZNF417 (Figure 4A, B), but showed much less repression of pBABE-RFP pseudoviral infection (Figure 4C, D). This evidence concerns the gene ZNF417 and infection.