运用实验方法区别共质体和跨细胞途径很难，对质外体和细胞到细胞途径综合作用的水分运输也缺乏有效的研究手段加以区分。
Symplast pathway and transcelluar pathway is difficultly distinguished by Experiment methods, and have no valid ways to make distinction between apoplast and cell to cell pathway.
蛋白偶联信号传导系统是一类重要的细胞跨膜信号传导途径之一。
G protein coupled signal transduction system is one major transmembrane signaling pathways in cell.
跨膜受体可从膜表面进入细胞核内直接调控细胞的生命活动，但其核转位的途径至今尚无定论。
Although transmembrane receptors from cell surface to nucleus can generally regulate the cellular life activities, their pathways of nuclear translocation still remain to be elucidated.
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