MOESM4 of Mechanisms of different response to ionizing irradiation in isogenic head and neck cancer cell lines

Additional file 4: Figure S2. Representative images of flow cytometry detection of apoptosis by FITC Annexin V/7-AAD staining before irradiation, 5 h, 24 h, 48 h and 72 h after 5 Gy irradiation. Bottom left quadrant are viable (Annexin V-negative and 7AAD-negative) cells, bottom right quadrant are early apoptotic (Annexin V-positive and 7AAD-negative) cells, top right quadrant are late apoptotic and/or necrotic (Annexin V-positive and 7AAD-positive) cells, and top left quadrant are necrotic (Annexin V-negative and 7AAD-positive) cells.