The transgene insert comprises 1468 bp of evolutionary conserved sequence (from ~935 kb upstream of Nr2f2; chr6:70960792-70962259 (GRCm39)) containing a vein-specific Nr2f2 enhancer, mouse Hsp68 minimal promoter and ~113 bp of 5' UTR, and the beta-galactosidase reporter gene. (J:270163)