This Vsx2 enhancer was targeted with sgRNAs (GUUAGACCUAGUCAGAACUC and GCAGGCCAUGUGCUCGUCGA) and an ssODN template (TGTAATACCTGTAGTGGCCAGAAGAGGGCATCAGATCCCCAGGAGCTGGAGTACCTACATCTTTGGTTGGTGGTTCAGTCTCTGAGAGCCCCAGGGGCCCAGGTTTGTTGACTCTGTTGG) using CRISPR/Cas9 technology, resulting in a 998 bp deletion (chr12:84578818-84579815 GRCm39). (J:328714)