Remarkably, localization of BATF3 and IL2RA and/or IL2RB in SE regions was a common feature in ALCL cell lines but not in primary T-cell controls or the Jurkat cell line (Fig. 1a, b, c and Supplementary Fig. 1a, b), indicating an ALCL-specific property. This evidence concerns the gene BATF3 and anaplastic large cell lymphoma.