Growth-Petri Plants (IMAGE) NASA/Johnson Space Center Caption Left: This is a white-light image showing a root tip growing on the surface of the agar medium. Middle: GFP gene expression image, showing the precise location of the cells within the root that are expressing this gene. Right: Combined image showing both location and gene expression data. Credit Dr. Anna-Lisa Pau/ Dr. Robert Ferl, University of Florida Usage Restrictions For news coverage in connection with this news story. 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.