Arabidopsis Cells (IMAGE) University of California - Riverside Caption Arabidopsis stem-cells (greenish-yellow) surrounded by differentiating cells (red). Niche cells (not seen here) are located beneath the stem cells. Credit Reddy lab, UC Riverside 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.