Exon 3 was replaced with an exon 3 that contained a nucleotide substitution that resulted in the amino acid substitution of cysteine for histidine at position 77 (H77C), mimicking a mutation associated with limb-girdle muscular dystrophy (LGMD2D) in human. A floxed neo cassette was inserted downstream of exon 3 and was subsequently removed by germ-line, cre-mediated recombination. (J:133929)