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The green area corresponds to on-pathway elongation (ke). The pink and blue areas represent off-pathway paused states where Pol II is backtracked; negative numbers indicate how many bases Pol II has backtracked from the elongation competent state, denoted by 0. The label u refers to the nucleosome being locally unwrapped (blue area), while w denotes the states where the nucleosome is wrapped in front of Pol II (pink area).
