However, one study previously found that, in the plasma and aneurysmal tissue of abdominal aortic aneurysm patients, in contrast to CD68 (+) mannose receptor (+) macrophages, CD68 (+) mannose receptor (–) macrophages may contribute to the development of oxidative stress, which is associated with abdominal aortic aneurysm formation in humans (44, 45). Here, CD68 is linked to abdominal aortic aneurysm.