The CRISPR/Cas9 genome editing system was used to generate Cd59 mutation in the Sprague Dawley embryos. The CRISPR/Cas9 targeting exon 3 of the rat Cd59 created a 11 bp-deletion (TGCAAAACAAA) in exon 3. No protein expression was detected in the blood smear of homozygous mutants. ASSOCIATED WITH decreased erythrocyte cell number; increased red blood cell distribution width; increased susceptibility to type III hypersensitivity reaction; ASSOCIATED WITH neuromyelitis optica