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(A) Model of the archaeal EC bound with Elf1 and Spt4/5. (B) Superimposition of Pol I EC with Spt4/5 in the Pol II ECs. The position of Spt5 KOW2-3-X-4 is indicated by a blue dashed line. The position of the A49 tandem winged-helix domain is indicated as a violet circle.
