This optional video goes into some more detail than you need for GCSE but it's very interesting.
Is personalized medicine for individual bodies in our future? Possibly -- with the use of stem cells, undifferentiated cells with the power to become any tissue in our bodies. Craig A. Kohn describes the role of these incredible, transforming cells and how scientists are harnessing their medical potential.
Source: TED Ed
Optional Video: SciShow - Stem Cells
This optional video gives you a few more things to consider about stem cells.
Hank gives you the facts on stem cells - what they are, what they're good for, where they come from, and how they're used in medicine.