Retraction Note: Zhang et al. Stem Cell Research & Therapy (2019) 10:74 https://doi.org/10.1186/s13287-019-1169-1

The Editors-in-Chief have retracted this Article. Concerns were raised about image overlap between Fig. 1 panels c and d (14d samples). The authors provided original data which contained further overlap between images with different labels. The Editors-in-Chief therefore no longer have confidence in the data presented in this article.

Ming Xue, Jingyuan Xu, Yi Yang and Fengmei Guo agree to this retraction. Xiwen Zhang, Jianxiao Chen, Yuying Tang, Ling Liu, Yingzi Huang and Haibo Qiu have not responded to any correspondence from the publisher about this retraction notice.