an experiment that would raise concerns ... is genetically
engineering mice to produce human sperm and eggs,
then doing in vitro fertilization to produce a child
whose parents are a pair of mice.
Weissman has already created mice with brains that are
about one percent human.
Weissman said he's not a mad scientist trying to create a human
in an animal body.
He hopes the experiment leads to a better understanding of
how the brain works
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