CRISPR-targeting, using sgRNAS targeting TGGCAGGATTAGCAGTTCAG and GGACTAGAGACTCTTCCACT, inserted a floxed rabbit beta-globin transcriptional terminator sequence 28.6 kb downstream of upstream exon U1 and 14.3 kb upstream of the Snrpn promoter at the Angelman syndrome imprinting center (AS-IC). Three founders were used interchangeably. (J:270068)