Methods Tetramethyl rhodamine(TMR) or horseradish peroxidase(HRP)retrograde tracing and biotinylated dextran amine(BDA) anterograde tracing techniques were used.

• 方法四甲基罗达明(TMR)或辣根过氧化物酶(HRP)逆行追踪和生物素葡聚糖胺(BDA)顺行追踪技术。