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HUVECs cultured on top of POC and POCA showed prolonged survival upon menadione stimulation for 120 minutes. POC and POCA provided protection from excessive ROS-induced cell death. A) Combined overlap image of contrast light microscopy with fluorescent image shown. Green indicates calcein AM stain for live cells. Bar=200 µm. B) Quantification of percentage of calcein AM positive cells after 120 minutes relative to unchallenged cells. N=4, Mean ± S.D., ** P<0.01.
