Clinical and histologic scoring of mice was monitored as previously reported [19 (link), 27 (link)]. The survival, body weight, and appearance of mice in each group were assessed before sacrifice at the indicated time point. The clinical score of GVHD was evaluated using a clinical scoring system as shown in Additional file 4: Figure S4a. For histologic scoring of mice, the sections of the liver, lung, and skin were stained with hematoxylin-eosin (H&E) staining and observed under a Nikon ElipseTi-U microscope (Nikon, Tokyo, Japan) as we described before [26 (link)]. Each pathological index of the lung, liver, or skin was graded from 0 to 3, and the total GVHD histologic index was the sum of the parameters listed in Additional file 5: Table S1.
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