Acknowledgements
We thank all of the patients and families who participated in the trial, particularly participant 021 and her family. We acknowledge assistance from S. Ventz, G. Park, L. M. Seften, K. Hoe Chow, A. Shetty, W. Pisano, E. Lapinskas and F. Watkinson; D. Hamm and B. Banbury for assistance in TCR analyses; and N. Caffo, J. Dwyer, D. Lane and H. White for assistance.