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What is a genome?
A genome is an organism’s complete set of DNA, including all of its genes. Each genome contains all of the information needed to build and maintain that organism. In humans, a copy of the entire genome—more than 3 billion DNA base pairs—is contained in all cells that have a nucleus.
For more information about genomes:
The U.S. Department of Energy Office of Science provides background information about the human genome in its fact sheet The Science Behind the Human Genome