The changes of 5-HT levels in hippocampus and cortex of CUMS rats treated with EA at Baihui and Yintang points. The expression levels of 5-HT in rats were detected by ELISA. (a) 5-HT levels in hippocampus. (b) 5-HT levels in cortex. The results were from the independent experiments in triplicate. A, CUMS compared with CON; B, Flu compared with CUMS; C, EA compared with CUMS; D, EA compared with sham EA; E, sham EA compared with CUMS.