TBK1 and infection: The TBK1 inhibitor GSK8612 (51) inhibited the IAV-induced cytopathicity of MDCK cells best when GSK8612 was added up to 3 h after infection (Fig. 5c, left panel), and treatment given only early in infection (−0.5 h to 12 h) was also effective (Fig. 5c, right panel).