CRISPR/Cas9 endonuclease-mediated genome editing is used to delete exons 3-7 using single stranded guide RNAs (TCAAGCCTGACAAGTACTGA and ATCAAGCCTGACAAGTACTG upstream of exon 3 and CCGTGATACCACCAGAAGGC and GGCTCCGTGATACCACCAGA downstream of exon 7). (J:101977)