Additional file 1: of Protease inhibitors enhance extracellular collagen fibril deposition in human mesenchymal stem cells HanSejin LiYuk ChanBarbara 2015 Expression of integrin α2β1. Immunopositive expression of integrin α2β1 for hMSC microencapsulated in collagen matrix. hMSC human mesenchymal stem cell. (TIFF 452 kb)