Li H, Jiang Y-M, Sun Y-F, Li P, Dang R-J, Ning H-M, Li Y-H, Zhang Y-J, Jiang X-X, Guo X-M, et al. CCR7 Expressing Mesenchymal Stem Cells Potently Inhibit Graft-versus-Host Disease by Spoiling the Fourth Supplemental Billingham's Tenet. PLoS One. 2014;9(12):e115720.