Stem-Cell Rebels

The battle over a controversial line of medical research resurfaces as states strike out on their own

Katie Zucker, 16, has sky blue eyes, wild curly hair and a dazzling smile. She is a champion equestrian and an A student. Her parents are doting, her friends devoted. So what's not to envy? Well, there's the small rectangular box attached to her belt that pumps insulin through a tube into her hip. To test her blood, she pricks her finger seven times a day. "It's scary," she says. "If your blood sugar goes too low, you could go into a coma." Sometimes at school her eyes swell, and she can't see the blackboard. She knows that her diabetes can...

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