CRISPR/cas9 genome editing used guide RNAs (TACCACGTGTCCTTCGGCTC; ATACCACGTGTCCTTCGGCT) designed to introduce a knock-in mutation and instead created a 137 bp deletion mutation involving intron 1 and exon 2 (GAGGACAAGTTATGCAGGTGCA/del137/AGACGGGGAATTTACAATGG). (J:101977)