Fig 2: Western blot analysis of total protein. a Effects of H9N2 and H5N1 infection on ATP5F1, ECHS1, HSPA1L and MDH2 total protein expression in A549 cells. b Western blot analysis of BAX and Caspase 3 protein levels in normal A549 cells and H5N1- and H9N2-infected A549 cells. ß-actin was used as an internal reference. *, p < 0.05; n = 3