Unless otherwise stated, the texts, graphics, videos, illustrations and other information on the National Human Genome Research Institute (NHGRI) website www.genome.gov are in the public domain . Public domain information may be freely distributed and copied; however, as a courtesy it is requested that NHGRI be given an appropriate acknowledgement such as: "Courtesy: National Human Genome Research Institute" with a link back to our homepage if used online.
Copyrighted text - usually scientific publications resulting from institute activities - is published on genome.gov from time to time with the permission of the copyright holder. Unless otherwise noted, website users are free to view and print these documents. If copyrighted, material will carry a credit line indicating that it did not originate at NHGRI. In this case, please be sure to cite the correct copyright owner. For information about these copyright owners, how they can be contacted, and what, if any, use those owners allow of their material beyond that which is stated here, please contact us through our Questions and Feedback page.
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Last Reviewed: April 4, 2014