Cell viability after exposure to H
and CSE. HUVECs were incubated for 16 hours in 96-well plates with or without 1–500 μM H2O2 or 0.5–5% CSE. Non-adherent cells were removed, and the number of adherent cells was counted by propidium iodide staining and spectrofluorimetry (13). **p < 0.01 vs cells not exposed to H2O2 or CSE.