This TALEN-mediated null mutation has a 61 bp deletion in exon 2, Chr 17: :34264928-34264988 (GRCm38), followed by 39 bp of retained endogenous sequence, then a 507 bp deletion, Chr 17: 34265028-34265534, with a 7 bp insertion (CCGTCAC) in its place, the impact of which is a disruption of most of exon 2. Flow cytometric analysis confirmed this to be a null allele. (J:268035)