About the Authors
Max Planck Institute for Immunobiology, Freiburg, Germany
Department of Experimental Oncology, European Institute of Oncology (IEO), IFOM-IEO Campus, Milan, Italy
The authors have declared that no competing interests exist.
DvE, GN, and SS conceived and designed the experiments. DvE, BE, GN, and SS performed the experiments. DvE and SS analyzed the data. DvE wrote the paper.