Plant Cell Growth (image) Iowa State University Share Print E-Mail Caption This illustration shows the parts of the expansin protein (magenta) that bind to the surface of specific regions of plant cell walls. Credit Illustration courtesy of Mei Hong/Iowa State University. Usage Restrictions None Share Print E-Mail 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.