Fig. 2From: Allogeneic umbilical cord-derived mesenchymal stem cell transplantation for treating chronic obstructive pulmonary disease: a pilot clinical studyWork-flow of UC-MSC production for clinical application. Donors were screened to select suitable donors for umbilical cord collection. Umbilical cord tissue was used to isolate UC-MSCs by primary culture; them UC-MSCs were expanded before they were freezed. During the process, UC-MSCs were checked to control the UC-MSC qualityBack to article page