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    In a remarkable—if likely controversial—feat, scientists announced today that they have created the firstsuccessful human-animal hybrids. The project proves that human cells can be   21    into a non-human organism,survive, and even grow inside a host animal, in this case, pigs. This biomedical advance has long been a dream forscientists hoping to address a critical   22    of donor organs.
     Every ten minutes, a person is   23   the national waiting list for organ transplants. And every day, 22 peopleon that list die without the organ they need. What if,   24    relying on a generous donor, you could grow a customorgan inside an animal instead?
     That’s now one step   25    reality, an international team of researchers led by the Salk Institute reports in thejournal Cell. The team created what’s known scientifically as a chimera: an organism that contains cells from twodifferent species.
21
(A) plugged
(B) introduced
(C) poured
(D) transformed

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