Actin Cytoskeleton and Plastids (image) American Journal of Botany Caption The actin cytoskeleton (green) and plastids (red) are believed to function in gravity sensing and signaling in plants. Credit Courtesy of Elison Blancaflor, Plant Biology Division, The Samuel Roberts Noble Foundation Inc., Ardmore, OK Usage Restrictions Cite original publication and credit line. 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.