H2O2 in Mice (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Bioluminescent signals from firefly luciferase lights up a mouse 30 minutes after injection with PCL-1, a probe that can be used to monitor hydrogen peroxides without harming the animal. Credit Photo from Christopher Chang group Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.