Figure 6. Effects of ISMN on HUVEC apoptosis by Annexin V-FITC/PI flow cytometry. Q1 (annexin V-/PI+) - cells with features of necrosis; Q2 (annexin V+/PI+) - cells with features of late apoptosis; Q3 (annexin V-/PI-) - viable cells; Q4 (annexin V+/PI-) - cells with features of early apoptosis.