This is one example of that: this is actually artificial skin.

举例来说,这是一张真正的人造皮肤

耶鲁公开课 - 生物医学工程探索课程节选

If I looked within the skin, one of the lower layers of your skin, the connective tissue layer, you'd find many fibroblasts there and they're just waiting in a more rounded shape than this, just waiting to do their job.

如果观察皮肤,更深处的一层细胞,结缔组织层,就能看到许多成纤维细胞,它们平时形状接近圆形,时刻准备着去完成自己的任务

耶鲁公开课 - 生物医学工程探索课程节选