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Cathryn Sundback, director of the tissue engineering lab at Massachusetts General Hospital, holds a laboratory rat implanted with a human-scaled ear made from sheep cells at the lab in Boston on July 2, 2012. The same lab also has created ears from human cells and hopes to start implanting them in patients in about a year. With ears destined for patients — they would just be grown in a lab dish until they're ready to implant. (Associated Press)

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