In order to attract the rabbit's own stem cells to re-grow the cartilage, channels in the scaffold were filled with a growth factor protein.

VOA: standard.2010.08.11

So we're going to typically also not worry about the multiplicative constants. This factor here.

要乘的常量这个因素太关注,我们真正需要关注的是。

麻省理工公开课 - 计算机科学及编程导论课程节选

They're sometimes called transcription factors and this is an example of a transcription factor that is itself activated or turned on by the presence of a steroid.

它们被称为转录因子,转录因子的一个例子就是,能够自激活或被激素激活

耶鲁公开课 - 生物医学工程探索课程节选