The article, “Immunoisolating Pancreatic Islets by Encapsulation with Selective Withdrawal” by J. L. Wyman, S. Kizilel, R. Skarbek, X. Zhao, M. Connors, W. S. Dillmore, W. L. Murphy, M. Mrksich,* S. R. Nagel,* and M. R. Garfinkel,* published online on March 6, 2007 (DOI:10.1002/smll.200600231) on Wiley Online Library (, and in print Small, 2007, 3, 683–690 has been retracted by agreement between the authors, the journal Editor-in-Chief, José Oliveira, and Wiley-VCH Verlag GmbH & Co. KGaA Weinheim.

After the publication of this article, the corresponding authors discovered that the results of Figure 6 could not be reproduced. Upon bringing this matter to the attention of the University of Chicago Academic Fraud Committee, the Committee came to the conclusion that Matthew Connors fabricated these data. The Committee determined that there was no evidence that the rest of the authors engaged in unethical behavior or were aware of the data being fabricated. No questions were raised with respect to the results describing the design of the apparatus for the selective withdrawal method and the photochemical cross-linking of a polymeric shell around the islets. The corresponding authors and the rest of the authors (other than Matthew Connors) have requested and agreed to this retraction.