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Cause of Port-Wine-Stain Birthmarks Pinpointed

Single, random change to gene during fetal development causes birthmarks and the more serious Sturge-Weber syndrome

continued...

"For some parents, it's going to be a huge relief," Ball said. "It's a huge lodestone that people carry for a while."

Ball said she didn't really feel the weight of her own guilt lift until recently, when she heard the news of the discovery.

"I didn't know if I had caused it," she said. "But I always felt that if I had caused it, then it was my responsibility to make it right."

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