Retraction.

Retraction: "Green tea polyphenols attenuate LPS-induced inflammation through upregulating microRNA-9 in murine chondrogenic ATDC5 cells," by Qiao Zhang, Yongkun Wang, Mingran Zhang, Hongliang Ying, J Cell Physiol. 2019; 22604-22612: The above article, published online on 17 May 2019 in Wiley Online Library (https://onlinelibrary.wiley.com/doi/full/10.1002/jcp.28826), has been retracted by agreement between the journal's Editor in Chief, Prof. Dr. Gregg Fields, and Wiley Periodicals LLC. The retraction has been agreed following an investigation based on allegations raised by a third party. Several flaws and inconsistencies between results presented and experimental methods described were found, the editors consider the conclusions of this article to be invalid. The authors collaborated in the investigation initially, but were not available for a final confirmation of the retraction.