DYSF and muscular disease: The DMD line was established from a patient with lacking EXON44 in the DMD gene (DMDΔ44), and the CRISPR‐Cas9 knock‐in isogenic control line (DMDΔ44‐Ctrl) was inserted with EXON44 via genome editing (Figure8A).[4, 26, 27] MM patient‐derived hiPSCs showed heterozygous mutations in each allele of the DYSFERLIN gene (Figure S6A, Supporting Information), causing a lack of the DYSFERLIN (DYSF) protein and progressive muscle disorders.