Training flasks (IMAGE) University of California - San Diego Caption Trained and untrained phages are pitted against bacteria in battleground flasks to evaluate which is more effective at killing. Credit Meyer Lab, UC San Diego Usage Restrictions Must be used in conjunction with PNAS paper on phage training. 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.