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Humans are considerably more genetically diverse than once thought, individually different not just by pairs of genes here and there, but in huge clusters of DNA segments missing or excessively duplicated across many parts of our chromosomes.
The new, more sophisticated map of human genes, published in a group of research papers this week in the journals Nature, Nature Genetics and Genome Research, suggests that the work of finding genetic causes of disease — and related ways to diagnose and prevent or treat them — may be more much complex than scientists thought even a few years ago............