A distinct evolution of the T-cell repertoire categorizes treatment refractory gastrointestinal acute graft-versus-disease Blood Meyer, E. H., Hsu, A. R., Liliental, J., Lohr, A., Zehnder, M., Strober, S., Lavori, P., Miklos, D. B., Johnson, D. S., Negrin, R. S. 2013; 121 (24): 4955-4962