英语语法分析

The expression of RET gene, however, showed a significant decrease in aganglionic segment when compared to the normal segment.

结果层粘连蛋白及其基因在狭窄段表达明显增高，从狭窄段到正常段逐渐减低；

It is suggested that the abnormal distribution of NOS positive nerves in aganglionic bowel is involved in the pathogenesis of HD.

NOS阳性神经在病变肠壁中的分布异常可能与HD的病理生理机制有关。