Varieties (IMAGE) Cornell University Caption Cornell and Florida State University researchers report they have identified 1 to 2 percent of the maize genome that turns genes on and off. Credit Credit:?Roberto?Leiro 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.