Macrophages Become Foam Cells (IMAGE) Washington University School of Medicine Caption On the left is a healthy macrophage cell with sufficient vitamin D. On the right is a macrophage with inadequate vitamin D has become clogged with cholesterol, an early marker of atherosclerosis. Credit Washington University School of Medicine 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.