Transgenic and Non-transgenic Tomato (IMAGE) Purdue University Caption The tomato with increased spermidine (top) stays fresh longer than those that do not have an increased level of the natural organic compound. Credit Purdue University photo/Avtar Handa 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.