Adult stem cells are also problematic, as they are difficult to identify, purify and grow, and simply may not exist for certain diseased tissues that need to be replaced.
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Nationality: American Type: Politician Born: February 18, 1947 |
“On the other hand, I think it is wonderful for everyone to take ballet classes, at any age. It gives you a discipline, it gives you a place to go. It gives you some control in your life.”
“It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong.”