RUNX3 and infection: We found that Runx3 protein was detected as two major p44 and p46 isoforms25 by a specific Runx3 antibody and that Runx3 was markedly induced by infection of IAV H1N1 PR/8/34 strain at a multiplicity of infection (MOI) of 1 in the BEAS-2B normal human bronchial epithelial cell line (Fig. 1a).