They're everywhere in cells throughout your body and they are responsible for lots of the biochemistry of cell/cell interaction and signaling.

它们在身体各处的细胞中都有,并负责很多细胞间的相互作用,及信号转导的生化过程

耶鲁公开课 - 生物医学工程探索课程节选

It does that through a complex set of sort of cellular interactions, and it turns out also gene rearrangements if you go further to study that.

而这此过程中,发生了一系列复杂的细胞间的相互作用,也会涉及到基因重排,如果你们深入学习的话就会学到

耶鲁公开课 - 生物医学工程探索课程节选