The present disclosure relates to targeted genome editing in eukaryotic cells or organisms. More particularly, the present disclosure provides for Cas9/RNA complexes that may induce modifications in target endogenous nucleic acid sequences in nucleuses of eukaryotic cells. The Cas9/RNA complex may comprise a recombinant Cas9 protein including a nuclear localization signal (NLS) and a guide RNA including a crRNA and a tracrRNA. The Cas9/RNA complex may be a combination of the recombinant Cas9 protein and the guide RNA. The guide RNA may be transcribed in vitro or synthesized chemically. The target endogenous nucleic acid sequence may include a portion complementary to the crRNA of the guide RNA.