<i>Science</i> Image (IMAGE) Salk Institute Caption This image of plant cells shows EIN2 (red), a protein that allows plants to control their response to ethylene gas, concentrated in the plant's nucleus (ringed in blue). Salk scientists discovered how EIN2 allows plants to respond to ethylene, which is crucial in fruit ripening and their response to stress. Credit Image: Courtesy of Hong Qiao, Salk Insitute for Biological Studies Usage Restrictions News media reproduction to illustrate this story permitted with proper attribution as provided above. For one time use only. 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.