| 21. | Despite the advances, xenotransplant experts expect human organs to remain the preferred choice for patients.
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| 22. | Kessler said each institution that carries out xenotransplants would be required to store such samples indefinitely.
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| 23. | If the San Francisco researchers succeed against immense odds, demand for such xenotransplants could be huge.
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| 24. | So scientists are breeding pigs _ the most likely species for xenotransplants _ specially tested against infections.
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| 25. | _1964 : At the University of Mississippi, Dr . James Hardy attempts the first heart xenotransplant.
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| 26. | Another obstacle facing xenotransplants is that of the body s rejection of foreign objects by its immune system.
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| 27. | If nothing is found in the initial few xenotransplants, should monitoring continue for 500 or 1, 000?
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| 28. | Novartis, a Swiss-based pharmaceutical giant, reportedly plans to spent $ 1 billion on xenotransplant research.
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| 29. | The dispute has been a boon to animal rights activists seeking to persuade federal officials to stop xenotransplant research.
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| 30. | Pigs are especially likely sources for xenotransplants, chosen for the anatomical and physiological characteristics they share with humans.
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