Schematic diagram of Arabidopsis root tip (IMAGE) University of Cambridge Caption Fig 1. Arabidopsis root tip depicting position of phloem cells running the length of the root. Credit Pawel Roszak Usage Restrictions To be republished only in reference to the original Science article and news release. 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.