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Human cloning - Wikipedia
Cloning Fact Sheet - National Human Genome Research Institute
Human Cloning | Center for Genetics and Society
Why haven't we cloned a human yet? | Live Science
Cloning humans? Biological, ethical, and social considerations
How does cloning work? | Live Science
Human Cloning: Biology, Ethics, and Social Implications
Scientific and Medical Aspects of Human Reproductive Cloning.
Human cloning: can it be made safe? | Nature Reviews Genetics
Human Cloning: Recent Advances and Bioethical Issues