A complex of Cas9 protein and gRNA was introduced into Iar:LE fertilized rat eggs by electroporation. Combi-CRISPR (Yoshimi K. et al.) was used to induce knock-in. Knock-in rats were selected and crossed with wild-type rats to establish this strain. Sequence features: the intron just before the fourth exon of the Pvalb gene (intron 3) is deleted by NHEJ after double-strand break by one base compared to the wild-type. ---ttggcgggccagaacctcagggg---(wild-type) ---ttggcgggccagaacc-cagggg---(knock-in)