OXB-IR fibers were located in the central gray substance, superior and inferior colliculi.
OXB-IR纤维位于中央灰色物质，上，下丘脑中。
In the mesencephalon, OXB-IR fibers were located in the central gray substance, superior and inferior colliculi, interpeduncular nucleus and raphe nuclei.
在中脑分布于中脑中央灰质、前丘、后丘、脚间核和中缝核；
AIM: To analyze the effect of substance K on pain modulation in the periaqueductal gray (PAG) of rats and indicate the neurotransmitter mechanism in endogenous analgesia system.
目的：分析K物质在大鼠中脑导水管周围灰质中参与痛觉调制的作用，揭示内源性镇痛系统的神经递质机制。
After the rain, as Zhao was about to start work, he noticed his recently washed car was covered with a gray, slushy substance.
雨后，赵师傅正准备出车，他注意到刚洗过的车被灰黑色黏土状的东西覆盖了。
After the rain, as Zhao was about to start work, he noticed his recently washed car was covered with a gray, slushy substance.
雨后，赵师傅正准备出车，他注意到刚洗过的车被灰黑色黏土状的东西覆盖了。
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