This "Ghost Heart." has been decellularized, leaving only connective tissue. It can then be reseeded with a patient's own cells to regenerate it so it can be transplanted without fear of rejection.

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"Researchers at the Texas Heart Institute created it by stripping all the living cells from a pig heart with a soap solution, which bursts the cells and leaves only the protein structure behind. These scientists have successfully implanted tissue-engineered hearts into rats and pigs so far. They hope ultimately to create personalized human hearts and help relieve the shortage of donor organs."