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We have followed up with the authors in relation to these concerns and they have indicated that the manuscript was submitted to PLOS ONE without their knowledge by a contractor hired to edit the language and that the first author Yuwang Tian is not a member of their research team. In the light of the concerns about the duplicate publication of the same work and the difference in the author list for the two articles, the PLOS ONE editors have contacted the Xi’an Jiaotong University to request an institutional investigation. The PLOS ONE editors are issuing this Expression of Concern to alert readers of the concerns about this publication. We will take further steps in relation to this article as necessary according to the outcome of the institutional investigation.

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Expression of Concern: Arsenic Sulfide Promotes Apoptosis in Retinoid Acid Resistant Human Acute Promyelocytic Leukemic NB4-R1 Cells through Downregulation of SET Protein