Retraction Note: Stem Cell Research & Therapy (2017) 8:164 https://doi.org/10.1186/s13287-017-0617-z

The Editors-in-Chief have retracted this article because overlap in cell images was identified in the published Figs. 2, 3 and 6. The authors provided the original files, but the data contained further cases of duplication. The Editor-in-Chief therefore no longer has confidence in the integrity of the data in this article.

All authors agree to this retraction.