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A fusion gene that results from a chromosomal translocation t(12;22)(q13;q12) which fuses the first 7 or 8 exons of the EWSR1 gene on the 5\' side of exon 4 or 5 of the ATF1 gene. This rearrangement is associated with both malignant clear cell sarcoma of the soft tissue and angiomatoid fibrous histiocytoma.
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