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下丘脑后核（ＰＨＮ）是参与大豆皂甙（Ｔｓ）中枢升压作用的主要核团之一。向ＰＨＮ内注射阿托品可减弱Ｔｓ在ＰＨＮ中的升压作用，表明它是通过激活Ｍ受体引起的。
The hypothalamic nucleus (PHN) is one of the main nuclei involved in the central pressor action of soybean saponin (Ts). Injection of atropine into the PHN attenuated the pressure-boosting effect of Ts in PHN, suggesting that it was caused by activation of the M receptor.