FTH1 and infection: To further examine the effects of FHC on CSFV replication, PK-15 cell lines stably overexpressing FHC (PK-LV-FHC) or green fluorescent protein (GFP) (PK-LV) were constructed via recombinant lentivirus infection; the MTT assay showed that recombinant lentivirus-mediated overexpression of FHC was not lethal to cells (Fig. 4b).