His research began with fruit flies, but over the last two decades, his focus has been on parasitic protozoa, single-celled organisms that cause major diseases.

VOA: standard.2010.04.05

We talked about last time that part of the process of going from this single cell to multi cellular many celled organisms like we are is cell division.

我们上节课说过,从一个单细胞分裂形成大量细胞,构成的器官的过程,叫做细胞分裂

耶鲁公开课 - 生物医学工程探索课程节选