Chinese scientists at the Shanghai Second Medical University in 2003 successfully fused human cells with rabbit eggs. The embryos were reportedly the first human-animal chimeras successfully created. They were allowed to develop for several days in a laboratory dish before the scientists destroyed the embryos to harvest their stem cells.
In Minnesota last year researchers at the Mayo Clinic created pigs with human blood flowing through their bodies.
And at Stanford University in California an experiment might be done later this year to create mice with human brains.
Scientists feel that, the more humanlike the animal, the better research model it makes for testing drugs or possibly growing “spare parts,” such as livers, to transplant into humans.
Watching how human cells mature and interact in a living creature may also lead to the discoveries of new medical treatments.
But creating human-animal chimeras—named after a monster in Greek mythology that had a lion’s head, goat’s body, and serpent’s tail—has raised troubling questions, this is even worse than experimenting on normal animals: What new subhuman combination should be produced and for what purpose? At what point would it be considered human and have human rights?
There are currently no U.S. federal laws that address these issues.
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