Hi, I'm trying to knockout one gene in murine PDAC cell lines. However, I found the knockout efficiency is only about 70% (by gDNA sequencing analysis). Because it's not a good idea to pick single clones because of high heterogeneity of murine PDAC cancer lines. Is there any good method to get relatively high-purity (perhaps>90%) murine KO lines? PS, I have tried a lot of sequencing and cannot improve by sequence optimization.