Pig Clones There are many scientific hurdles to be cleared before dreams of using animal organs for human transplants have a chance of becoming reality. While two teams of scientists report progress this week in developing the means to create genetically engineered pigs whose organs will be accepted by the human body, another group of researchers shows that the risk of transferring animal viruses to humans during transplants could be a real one. NPR's David Kestenbaum has more.

Pig Clones

Pig Clones

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There are many scientific hurdles to be cleared before dreams of using animal organs for human transplants have a chance of becoming reality. While two teams of scientists report progress this week in developing the means to create genetically engineered pigs whose organs will be accepted by the human body, another group of researchers shows that the risk of transferring animal viruses to humans during transplants could be a real one. NPR's David Kestenbaum has more.