结论神经生长因子能增加大鼠心肌梗塞后胆碱能神经纤维的密度，可能对心梗有治疗作用。

Conclusion NGF increases the density of the cholinergic fibers in AMI rat and might have the possible effect on the treatment of AMI.

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哮喘；神经生长因子；大鼠。

Asthma; Nerve growth factor; Rat.

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目的：研究慢性脑缺血时大鼠大脑皮质中神经生长因子(NGF)的表达变化，探讨缺血性脑损伤及修复机制。

Objective: to investigate the expression of nerve growth factor (NGF) in cerebral cortex of chronic cerebral ischemia rats, and to explore the mechanism of cerebral ischemia damage and recovery.

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