Figure 1.

Foam cell formation. Foam cells were formed after the incubation of human monocyte derived from macrophages with 100 μg/mL of oxidized low-density lipoprotein (LDL) for 2 days. After fixation with formalin for 1 h, intracellular lipids were stained using Oil Red O. Images were prepared with an Olympus microphotographic system at a magnification of 60×.