To investigate whether MARCH1 isoforms differed in their ability to restrict IAV infectivity, virus titres were determined at 2 versus 24 hpi following the infection of uninduced (no DOX) 293T cells expressing MARCH1.1, MARCH1.2 or MARCH8, or the same cells induced with DOX 24 h prior to (DOX before) or immediately after infection (DOX after). Here, MARCHF8 is linked to infection.