Expression of concern

In the May 1, 2012 issue, Cell Cycle published "Chalcone-based small-molecule inhibitors attenuate malignant phenotype via targeting deubiquitinating enzymes" (10.4161/cc.20174), a Report by Olga A. Issaenko and Alexander Yu Amerik. The publishers now express a note of concern regarding this article. In October 2012, the first author claimed copyright infringement of her work by a competing researcher Dr Martina Bazzaro of the University of Minnesota, in whose lab Dr Issaenko was employed from September 2009 to July 2010. In return, the University of Minnesota performed a review of Dr Bazzaro’s laboratory materials from 2010 and claim ownership of data from Table 1 and parts of Figures 1–6. These claims have been denied, and the dispute is ongoing.