CRISPR targeting of exon 3 using sgRNAs AAATCGTCCCATTCCACAATGG and GAAGGTCTTGTGAGAAGCCATG produced small deletions. Three mouse lines, with a 1-bp, 11-bp, and 13-bp deletions were generated. The pound (#) in the allele symbol is used for this pooled allele. (J:333015)