Rosa26{R26-60-3XCNotch-TA-Cerulean} mouse ESC line A mouse ESC line in which part or all of the targeted gene, gene trap ROSA 26, Philippe Soriano (NCBI Gene ID: 14910) is replaced to create Rosa26{(R26-60-CNotch-TA-Cerulean)} using the Loxed Cassette Acceptor allele Rosa26{tm1(LCA)}). The Rosa26 gene sequences from -228 to +81 were replaced with a repeat of alternating 32-bp C-elements and 31-bp Rbpj-binding sites (i.e.,C-R-C-R-C-R). The 31 base-pair region is derived from the CBF1/Rbpj binding region of the C-promoter of EBV (cataaattTTTTCCCACGgcgtgtttacacc; uppercase letters are the consensus Rbpj binding sequence within the 31-bp element) (Hsieh, MCB 16:952, 1996). The 32-bp C-element is from the Ela1 enhancer (Kruse et al., MCB 15:4385, 1995). Person: Mark A. Magnuson, Jill Lindner, Jean-Philippe Cartailler Vanderbilt University Medical Center stem cell derived cell line