Ethylene hormone research team (IMAGE) Purdue University Caption PhD candidate Yuan-Chi Chien (left), postdoctoral researcher Hye Lin Park (center), conduct research on the ethylene hormone with associate professor Gyeong Mee Yoon in the department of botany and plant pathology at Purdue University. Credit Purdue University Photo/Tom Campbell Usage Restrictions News organizations may use this image in reports about the work of Purdue University's Gyeong Mee Yoon and her collaborators. 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.