Myh enhancer A, a sub-region of super enhancer Rr194, was deleted using sgRNAs (targeting GAGAAGAGTCTCGTCATTGTGG, GTCACACTGCCCATCCTCGAGGG, GATGTTCTGCCCTCGAGGATGGG, GATGGAAGGACCCCTAATTAGG, GCAGACAAGGCCTTCAATTAGGGG and GTCTCTGACATCAAGCCATGCAGG) with CRISPR/Cas9 technology. The deletion covers chr11:67029517-67036375 (GRCm39). (J:322002)