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A fusion gene that results from an intrachromosomal deletion of the pseudoautosomal region 1of Xp22.3 and Yp11.3 which fuses the noncoding exon 1 of the P2RY8 gene to the entire coding region of the CRLF2 gene. This rearrangement is associated with Down syndrome-associated acute lymphoblastic leukemia.
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