Mesenchymal Cells (IMAGE) Morgridge Institute for Research Caption These are mesenchymal arterial cells, which become more star-shaped and can pile up on one another, leading to a thickening or buildup in the arteries. Credit Morgridge Institute for Research 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.