Cysteine codon 443 (TGT) in exon 5 was changed to serine (TCT) (p.C443S) using crRNA (UGAGUCAAGUAAACAAUCUCGUUUUAGAGCUAUGCUGUUUUG), tracrRNA (AAACAGCAUAGCAAGUUAAAAUAAGGCUAGUCCGUUAUCAACUUGAAAAAGUGGCACCGAGUCGGUGCU) and an ssODN template (CGAAGCACCGAGTCTTTGTCATAAATTGCCCCATGTAGCTTGTAGTACTGAGTCAAGTAAAGAATCTCCGGCAGTCCGGTTCCAAAGTGCATATAGTCTACTGTCCAGACGTGTAGCCAACT) with CRISPR/Cas9 technology. The mutation renders the peptide enzymatically inactive. (J:333468)