Fig. 1

Population doubling time (PDT) of different human mesenchymal stem cells. Bone marrow (BM)-, adipose tissue (AT)- and umbilical cord (UC)-derived human mesenchymal stem cells (hMSCs) in Reference media (Commercial medium 1, Commercial Medium 2, FBS-Medium), XF-Medium and PL-Medium (n = 3–22. *Denotes p < 0.05)