Sequences of fusion transcripts. Electropherogram showing the fusion transcripts involving ETV6 and the catalytically active NTRK3 isoform (3a) and ETV6 fused to the truncated NTRK3 isoform (3b). In either case, sequencing was done in both directions with only one being shown. (3c) Proposed structure of the entire fusion transcripts. ETV6 (pale orange) being fused to the catalytically active NTRK3 (green) isoform (upper) and to the truncated isoform of NTRK3 (lower), resp.