Cas9 nuclease has two domains - RuvC nuclease domain and HNH nuclease domain. Dead Cas9 (dCas9) results from two mutations: one in RuvC domain (D10A) and the other in HNH domain. Some references mention the second mutation as H840A (e.g., Ran et al. 2013) while some others (e.g., Qi et al. 2013; Sun et al. 2016) mention the second mutation as H841A, which has created confusing situation. Will some one please clarify as to which one is correct?

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