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Plasma nitrate/nitrite levels in WKY and SHR under control- or EA-treated at GV20 (SHR-GV20) or non-acupoint (SHR-tail) conditions. Results are expressed as mean ± SEM for six rats in each group. *P < .05, compared with WKY group; † P < .05 compared with no-treated SHR group.
