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Fig. 3. Aorta with enormous atheromatosis in a rabbit fed on a high cholesterol diet for 

 three months and irradiated with 3,000 r over the aortic region 1 week before sacrifice. 



Fig. 4. Effect of irradiation with .500 r on the injection pressure in the medial portion of a 

 cow aorta. On the left is the calibration signal corresponding to a pressure of 100 mm Hg. The 

 lower line gives the irradiation signals for both needles. 



