RETRACTED: Induction of a Homeostatic Circuit in Lung Tissue by Microbial Compounds

This article has been retracted at the request of the inhouse Editor, Peter Lee, and the authors. The text below has been agreed between Peter Lee and the corresponding author. Please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).Reason: The authors discovered that a duplication of several gel images occurred during the preparation of the above manuscript. Specifically, the gel images in Figure 2A were duplicated within Figure 2A, and in Figures 5F and 6B. These figures are important in showing the amount of Smad 2/3 as an indicator of alveolar macrophage-epithelial cell interactions, which explains the mechanism of the proposed homeostatic circuit in the lungs, and thus we are retracting the manuscript. The authors stand by the validity of the other figures, and sincerely apologize for the inconvenience caused by this retraction.