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The extent of DNA compaction depends on the length of the α-linker. (A–D) Contour length distributions of DNA in the absence (hatched bars; top) and presence (grey bars; bottom) of RNAP derivatives, from experiments with RNAP derivatives lacking residues of the α-linker. Apparent DNA compaction is presented as mean±s.e.m. α-linker, α-subunit interdomain linker; RNAP, RNA polymerase.
