What happens when matter changes state? The mass of the sample is altered.
The chemical composition is altered.
The chemical composition remains the same.
The temperature remains the same.

Pros: Trans differentiate and reprogramming of these cells is possible but is not well studied. Thought to be less likely to be rejected if used in transplants. Success has already been demonstrated in various clinical applications

Cons: Limitations on ASC ability to differentiate are still uncertain; currently thought to be multi or unipotent. Cannot be grown for long periods of time in culture. Usually a very small number in each tissue making them difficult to find and purify. Currently there is no technology available to generate large quantities of stem cells in culture