Retraction Note To: Stem Cell Research & Therapy (2021) 12:2 https://doi.org/10.1186/s13287-020-02030-w

The Editors-in-Chief have retracted this paper after the authors reported discrepancies in the data. Specifically, the authors have stated that the data presented in the paper is incomplete; that the analysis did not use appropriate statistical tests, and that the combination of these factors resulted in inaccurate conclusions that are not supported by the data. Further investigation from the publisher has found that Figure 4B displays the same image as Figure 1D in Gou et al. [1]. The authors were not able to provide a satisfactory explanation for the overlap. All authors agree to this retraction.