英语语法分析

Conclusions: Delayed reimplantation of avulsion ventral root can enhance motoneuron survival and regeneration.

结论：前根撕脱延期再植回能促进脊髓前角运动神经元的存活与再生。

Objective to extract the neurotrophic factors with motoneuron neurotrophic activity from the brains of embryo.

目的从人胚胎脑中提取对运动神经元具有生物活性的神经营养因子。

Conclusions: the limb bud extract showed marked motoneuron neurotrophic activities compared with the two controls.

结论：与两对照组相比，胎鼠肢芽提取液呈现了显著的运动神经营养活性。