SERINC5 and infection: We initially measured viral RNA levels in the splenic extracts and found that F-MLV/AmphoEnv viral RNA levels were similar in BL/6 and SERINC5−/− mice (Fig. 6C) whereas gGagmutF-MLV/AmphoEnv viral RNA levels were higher in the splenic extracts from the SERINC5−/− mice than in those from the BL/6 mice (Fig. 6D), which reflects the higher infection levels of the former (Fig. 6B).