The wild type rats were littermates of cross of heterozygotes Cp mutant rats. The mutations created by CRISPR/Cas9 contained a 54- bp deletion and a 2-bp insertion in exon1 of Cp, resulted a premature stop coden in exon 2. The sgRNAcr377 (TacGene, Paris, France) used targeted the exon 1 of Cp and had the following sequence: 59-GGAAT-TACTGAAGCAGTTT-39.