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CRISPR/Cas system,or Cas9/gRNA system,is a newly developed and highly effective tool for gene targeting used in many organisms and cultured cells.This system is very easy to design or engineer and it promotes the broad and fast-developing application of engineered endonuclease(EEN)technology in many model animals such as zebrafish.However,the specificity of Cas9/gRNA still needs careful evaluation.For example,it is reported to show considerable off-targeting effects in cultured human cells.