Artificial joints normally last 12 to 13 years, but regenerative cartilage could make them obsolete, according to Tetsuya Tateishi, a professor at the University of Tokyo.

Toward the end of the 1990s, a U.S. researcher discovered an “all-purpose cell” that could grow in any part of the human body. In theory, the cell could reproduce not only livers and kidneys, but also hands and feet.

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