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Definition of Deletion

Deletion: Loss of a segment of DNA from a chromosome. A chromosome deletion can cause disease. An example is the cri du chat (cat cry) syndrome, which is due to loss of part of chromosome 5. The opposite of duplication.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=2936
Last Editorial Review: 3/19/2012

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