Plant Phloem Differentiation in a Root (IMAGE) University of Helsinki Caption This shows a cell file undergoing sieve element differentiation in the root as captured by msPI staining. Credit Helariutta group, University of Helsinki Usage Restrictions By adding credit 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.