The rat strain was produced by injecting CRISPR/Cas9 targeting rat Scn2a into Crl:LE embryos. The mutant allele was produced by injecting CRISPR/Cas9 targeting rat Scn2a into Crl:LE embryos. The resulting mutation is net 4-bp deletion in exon 5 comprising a 10-bp deletion (shown in lower case: CTACGGGATccctggaattGGTTGGATTTCACAGTCATT ) and a 6-bp insertion (TTCACT).