Fig. 4

Infiltration of leukocytes in carotid artery lesions is reduced in diabetics under metformin treatment. Light microscopic pictures of human carotid atherosclerotic lesion from non-diabetic patients (a), from diabetic patients without metformin intake (b) and from diabetic patients with metformin intake (c). Hematoxylin–eosin staining. Original magnification ×40. Scale bar 320 nm. Representative pictures are shown