Bacterial Pulse Response to Stress (IMAGE) California Institute of Technology Caption By attaching fluorescent proteins to the genetic circuit responsible for B. subtilis's stress response, the researchers can observe the cells' pulses as green flashes. Credit Caltech/Elowitz Lab 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.