Using a combining method of HRP retrograde tracing with immunocytochemistry, HRP and substance P immunoreactivity double-labeled neurons were observed in the red nucleus of rats.

• 用辣根过氧化物酶(HRP)逆行标记与免疫细胞化学相结合方法,在大鼠红核内观察到HRP阳性与P物质反应阳性的双重标记神经元。