TALEN (Left: ttcagAATGATTCATGGG, Right : ACGCACTCTTCAAAGCTA) targeting the exon4 of hyperpolarization-activated cyclic nucleotide-gated 1 channel (Hcn1) gene was designed and mRNA coding these TALEN was microinjected into F344/NSlc embyo. A 18-bp deletion in the exon4 of Hcn1 gene. It is predicted that 6 amino-acid deleted HCN1 protein is expressed.