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Philadelphia chromosome
Phil·a·del·phi·a chro·mo·some


noun 
Definition:
 
genetic cause of leukemia: a chromosomal defect in which the long arm of chromosome 22 and its attachment to another chromosome is deleted. It appears to cause myeloid leukemia.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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