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Immunohistochemistry localization of nitrotyrosine expression in aorta tissues. The negative (−ve) control used no nitrotyrosine antibodies and yielded no staining of tissues. In the SHR control and sham-acupuncture group, a clear staining of the intima was observed. In the acupuncture group, the intensity of the staining was attenuated, while the WKY control group only showed a weak signal
