We are grateful to Axel Schambach, Maike Stahlhut, Then Cheong Ha and Claudia Lengerke for donating the vector pRRL.PPT.SF.i2GFPp and to Eva Geißinger and Olaf Merkel for providing the ALK- ALCL cell line Mac-1 and Mac-2A. This evidence concerns the gene ALK and anaplastic large cell lymphoma.