DNA extraction (IMAGE) Purdue University Caption Sample being taken from the fin of a frozen pupfish for DNA extraction, which will be used for genome sequencing. Credit Purdue Agricultural Communications/Tom Campbell Usage Restrictions News organizations may use this image in reports about the work of Purdue University’s Andrew DeWoody and his associates. License Original 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.