The new regulatory element (NRE) in the 3' UTR was targeted with gRNAs (targeting TTGTCTTAATAACGCTGATT and ATTTCTCTCAATGACCCGTA) using CRISPR/Cas9 technology, resulting in a 76 bp deletion (GCTGATTTGGTGACCAGGCTGTCGCTACATCACTGAACCTCTGCTCCCCACGGGAGCCGTGACTGTAATCGCCCTA). (J:306876)