In medical research,it is very important to construct the model according to the disease model. The construction of the model has a very important significance for the study of the occurrence and treatment of the disease. With the development of science and technology,the requirement of gene editing technology applied in the construction of the disease model is improved,and CRISPR / Cas gene editing technology emerged as the times require. CRISPR / Cas is a kind of immune mechanism in bacteria and ancient b...