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Three types of Level-1 events and the corresponding DNA movement pathways in the nanopore. (a–c) Current profiles for Level-1a (a), Level-1b (b) and Level-1c (c) events, and the corresponding models for different DNA movement pathways in the pore upon unzipping; (d) weak voltage-dependence of fractions of event numbers for the three types of Level-1 events.
