This program is an introduction to stem cells. It assumes no prior knowledge, and covers the following topics:

- What stem cells are
- The difference between embryonic and adult stem cells
- IVF as a key source of embryonic stem cells
- Therapeutic cloning (somatic cell nuclear transfer)
- The difference between therapeutic and reproductive cloning
- Potential medical applications of stem cell research
- A brief overview of ethical issues raised by stem cell research.

人類細胞中的幹細胞，是細胞分化過程中初始階段的母細胞。幹細胞具有發育為各種特殊功能或身體各部 位細胞的能力，即使發育成熟後，幹細胞仍然存在於生命體中，並擔負著個體的各個組織及器官的細胞更新及受傷修復等重任。本節目介紹胚胎幹細胞與成人幹細胞的分別；體外受精取得胚胎幹細胞的主要來源；治療性克隆及其與生殖性克隆的分別；醫學上的應用及引發的道德倫理規範議題。備有中文字幕。

30 mins.
English with Chinese Substitles