Cytoplasmic injection of Cas9 mRNA and sgRNAs (5'-GAGAAGGGAAAATTTCTGG-3' and 5'-AGGGCAGAGTGATGTTGTC-3') into zygotes resulted in compound heterozygous F1 mice (from F0 founder crosses) and homozygous F2 mice (from F1 crosses). Mutations varied from 1-5 bp insertions to 1-1632 bp deletions. A total of 12 different alleles were generated. (J:226780)