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Figure 2 Aortic valve photographs from rabbits over study period. The aortic valve is shown from the ascending aorta. (A) Control after four months; (B) hypertension (HTA) after two months; (C) HTA after four months. The control aortic valves have a clear glistening appearance, whereas valves from hypertensive animals show marked signs of tissue hypertrophy after four months.