Proline codon 1019 (CCT) in exon 29 was targeted for change to an arginine codon (CGT)(p.P1019R) with an sgRNA (targeting TTGAGAATACTCACAAGAGGAGG) and an ssODN template (ATTTCGAAGGCCAAAGAATATACATCTCCGAAATTTCTATATCATTGTTCGTCCTCTTGTGAGTATTCTCAAAACTAGAAGTGAGTTATTGATGGGTGTTAATACAGATTCAGTTTCCATAAAGCA) using CRISPR/Cas9 technology. The mutation mimics a mutation found in some human WiskottâAldrich syndrome patients.