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December 28, 2018

Retraction of a research paper

 A research paper published in Cell Stem Cell (CSC) in 2012, which listed Prof. Jun Yamashita of Kyoto University as the corresponding author, has been retracted. The research leading to the article was done when he was affiliated with another institution at the university. The journal issued its retraction notice online at 1 a.m.(JST)on December 28, 2018.

 Kyoto University announced in January 2018 that the first author of this CSC article had conducted research fraud in another paper. In response, Prof. Yamashita volunteered to have past articles he co-authored with the first author be reevaluated. Although the research for the CSC article was not conducted at CiRA, several faculty members at CiRA gave him advice on his voluntary reevaluation.

 The results were that one cell line described in the CSC article was not found and that the construction process of the cell line was not sufficiently recorded in laboratory notebooks.

 Prof. Yamashita reported the findings to an editor of CSC and inquired about the appropriate action including retraction. CSC decided that "the most responsible course of action is to retract the paper." All authors of the CSC article agreed to the retraction.

About the article
Protein Kinase A Determines Timing of Early Differentiation through Epigenetic Regulation with G9a
Journal:Cell Stem Cell
Published year:June 14, 2012(Online)
Page:Volume 10, Issue 6, Pages 759-770
Kohei Yamamizu*, Mayako Fujihara, Makoto Tachibana, Shiori Katayama, Akiko Takahashi, Eiji Hara, Hiroshi Imai, Yoichi Shinkai, Jun K. Yamashita** ( *:first author, **:corresponding author)
This article reports a partial mechanism that accelerates the early phase differentiation of mouse embryonic stem cells.

<Comments from Prof. Jun Yamashita>
"I sincerely apologize to all people including the coauthors for any inconvenience resulting from the retraction of the article for which I was a corresponding author. After a voluntary reassessment of the CSC paper, I found unverifiable claims. I deeply regret that my supervision as a corresponding author was insufficient and will take greatest care in the future."

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