JAPAN LIFTS CHIMERAS BAN to make human organs.”Stem cell biologist Hiromitsu Nakauchi of the University of Tokyo has been pursuing the idea of implanting human pluripotent stem cells, which can differentiate into any of the cells in the human body, into pig embryos engineered to be incapable of developing their own pancreases. If the technique works, the stem cells will develop into human pancreases in the pig fetus.””
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http://www.geneticsandsociety.org/article.php?id=6963