The transgenic vector contains a modified human ACTA1 promoter driving expression of full-length mouse Atf6 cDNA. The modified promoter incorporates 2 kb of 5' flanking sequence, 90 bases of 5'-UTR, and 149 bases of IVS1 (intervening sequence 1) from the human ACTA1 gene. This is founder line 3. (J:238094)