Figure 3. The role of testosterone and Gas6/Axl in structural changes of aging vessel. (A) Carotid artery (CA) and abdominal aorta (AA) of ultrasonography. (B) Intima-media thickness (IMT) of carotid artery. (C) Systolic diameter (Ds) and diastolic diameter (Dd) of carotid artery. (D) Coefficient distention (CD) of carotid artery. (E) IMT of abdominal aorta. (F) Ds and Dd of abdominal aorta. (G) CD of abdominal aorta. Data are mean ± SD; *P < 0.05, **P < 0.01 and ***P < 0.001 vs. WT young group; †P < 0.05 vs. WT old group; &P < 0.05, &&P < 0.01 and &&&P < 0.001 vs. Axl-/- young group; #P<0.05 vs. Axl-/- old group; n = 8 for each group.