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Figure 3 Sections of canine left ventricular myocardium: (a) not exposed to ultrasound; (b) exposed to 60-min ultrasound; and (c) from a dog pretreated with L-NAME and then exposed to 60-min ultrasound. Note the size (circumference) of the capillaries (arrows) is larger in the area exposed to ultrasound (b) than in the control (a) and the dog pretreated with L-NAME (c). Bar = 50 µ; hematoxylin-eosin stain. C = capillary.
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