The Myh super enhancer was deleted using sgRNAs (targeting GGGGACTCCTATGTAAGCAA, TCTAGGAGGCCGAGAATGCC, TTGGGAGCAGTCCCATCTGG, CCATGGAAGGACCCCTAATT, CAGACAAGGCCTTCAATTAG and TCTCTGACATCAAGCCATGC) with CRISPR/Cas9 technology. The deletion covers chr11:66994497-67036366 (GRCm39). (J:322002)