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NAI species generated by different methods and evolution of oxygen-based NAIs. There were some differences in NAI compositions from different studies as their experimental conditions might vary. (A) NAI compositions. (B) The evolution of oxygen-based NAIs. The blue arrows indicate the NAI transformation processes. Please refer to the cited paper for more details [31,37,52,53,56,57,58,59,60,61,62,63,64,65,66].
