Additional file 1: Fig. S1. Surface marker expression in hUMSCs. hUMSCs were confirmed by flow cytometry analysis following three passages as positive for CD73 (100%), CD105 (99.96%), and CD90 (100%), and negative for CD45 (0.06%), HLA-DR (0.06%), CD34 (0.01%), CD11b (0.01%), and CD19 (0.00%).