Retraction Note to: Stem Cell Research & Therapy (2021) 12:449 https://doi.org/10.1186/s13287-021-02371-0

The Editors-in-Chief have retracted this article because there are regions of overlap between Fig. 2A and Fig. 4A. The Editors-in-Chief therefore no longer have confidence in the data presented.

Li Chen does not agree to this retraction. None of the other authors has responded to any correspondence from the publisher about this retraction.