Atherosclerotic plaques or foam cells showed by oil red O staining in frozen sections of aorta roots of the mice. (A) Atherosclerotic plaque formed in apoE-/- mouse aortas fed with a high-fat diet, ×100. (B) C57BL/6J mouse, ×100. (C) Foam cells were found in apoE-/- mouse aorta roots, ×100. (D) The rectangle in Fig C shows foam cells under the endothelium, ×400.