Rosa26{mIre1.WT.Cherry} mouse ESC line A mouse ESC line in which part or all of the targeted gene, Gt(ROSA)26Sor gene trap ROSA 26, Philippe Soriano [ Mus musculus ] (NCBI Gene ID: 14910) is replaced to create Rosa26 LCA using the Loxed Cassette Acceptor allele Rosa26{tm1.1(mlre1.WT.Cherry)FerozPapa}). This mESC line contains a bidirectional Tet0-regulated fusion gene that has been inserted into a disabled Rosa26 loxed cassette acceptor allele by RMCE. In one direction the tetO/CMV promoter drives expression of a red fluorescent protein (Cherry) while in the other direction it drives the wild type form of mlre1. mlre1 is an endoplasmic reticulum (ER) membrane kinase response to unfolded protein response (UPR). Activated mlre1 endonucleases leads to the splicing of XBP-1 (a transcription factor which is upregulated in times of ER stress) which transcriptionally increases the expression of ER chaperones and alleviates UPR. This cell line should be useful for studying the role of mlre1 in the response to ER stress. By generating mice with this allele Person: Mark A. Magnuson, Jill Lindner, Jean-Philippe Cartailler Vanderbilt University Medical Center stem cell derived cell line