Fig. 3From: Polymerase acidic subunit of H9N2 polymerase complex induces cell apoptosis by binding to PDCD 7 in A549 cellsOverexpression of PA subunit induced cell apoptosis. a–b Flow cytometry analysis of cell apoptosis by Annexin V and PI staining in A549 cells overexpressed with Flag-PA, Early apoptosis: E-apoptosis; Late apoptosis: L-apoptosis. c Western blot analysis of apoptosis related proteins in A549 cells. d quantitative results of apoptotic related proteins by Image J. “**” means P < 0.01Back to article page