DNA transfer (IMAGE) Purdue University Caption The DNA transfer method shown involves using a syringe to inject a specific species of bacterium into the petunia stigma to activate targeted genes, then isolating the resulting proteins. Credit Purdue Agricultural Communications photo/Tom Campbell Usage Restrictions News organizations may use this image in reports about the work of Purdue University's Natalia Dudareva and her 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.