The BCR/ABL1 fusion gene is usually found on der(22).     ///    In all cases the BCR/ABL1 fusion gene was located on the Ph chromosome whereas the reciprocal ABL1/BCR gene was detected only in patient #2.     ///    The BCR/ABL1 D-FISH probe was applied to localize the BCR/ABL1 fusion gene as well as the 5'ABL1 and the 3'BCR. 