Sampling Water (IMAGE) University of Notre Dame Caption Researchers collected water samples from area lakes, ponds and streams and used polymerase chain reaction (PCR) technology to amplify -- or copy -- the entire mitochondrial genomes from the eDNA found in those environments. Credit University of Notre Dame 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.