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应用PAP免疫组织化学技术对大鼠心内血管活性肠肽神经元进行了研究、结果表明：在大鼠心脏心房后壁和心传导系统中的心内神经节内，存在着血管活性肠肽免疫活性神经细胞，这些细胞多为梭形或圆形，大小中等，并对它的功能进行了讨论。
PAP immunohistochemistry was used to study the intra-cardiac vasoactive intestinal peptide neurons in rats. The results showed that vasoactive intestinal peptide immunization was present in the intracardiac ganglia in the atrial posterior wall of the rat heart and in the cardiac conduction system Active nerve cells, these cells mostly fusiform or circular, medium size, and its function was discussed.