FURIN and infection: The parental Chinese hamster ovary (CHO)-derived cell lines (Par6), furin-deficient (FD11) [27], and furin-reconstituted FD11 (FD11-Fur) were infected with CCHFV or RVFV at multiplicity of infection (MOI) of 1 or 0.1, respectively, and percentages of infected cells were determined 24 and 48 h post infection (Fig 6A).