Retraction.

'Tetramethylpyrazine partially relieves hypoxia-caused damage of cardiomyocytes H9c2 by downregulation of miR-449a', by Xuesong Zhang, Huawei Dong, Yong Liu, Junxia Han, Shouyi Tang, Jingna Si, J Cell Physiol. 2019; 15098-15107: The above article, published online on 15 February 2019 in Wiley Online Library (https://onlinelibrary.wiley.com/doi/full/10.1002/jcp.28151), has been retracted by agreement between the journal's Editor in Chief, Prof.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.