From stem cell to any cell

The search is on for ways to use stem cells to treat injuries and cure diseases.

By Emily Sohn, 00:00 AM October 11, 2005

For maybe a day, about 9 months before you were born, you were just one cell. Then you were two identical cells. Then you were four. Then eight.

 

Since then, you've grown into a complicated organism with many trillions of cells grouped into specialized tissues and organs. The cells in your brain do the thinking. The cells in your heart pump blood. The cells in your tongue let you taste food. And so on.

 

In recent years, scientists have made an amazing discovery. Even though most cells have spec...

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