KLF4 and infection: To verify these analyses, we performed ChIP-qPCR of the day 5 HDFs after infection with SeV-OSKL or SeV-OSKLH using OCT4 and KLF 4 antibodies to detect L1TD1 and NANOG. The results showed that OSKLH-infected cells had significantly higher levels of L1TD1 occupying both OCT4 and KLF4, and higher levels of NANOG occupying KLF4 (Figure 3E).