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The Repressor Binding Site

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Description
The DNA site bound by lac repressor has been analyzed by footprinting and methylation-protection experiments of the type described earlier for RNA polymerase.
The operator comprises 35 base pairs, including 28 base pairs of symmetrical sequence; that is, it includes a sequence that is identical in both directions.
Thus, the operator is an imperfect palindrome—imperfect because of the seven base pairs that do not show this symmetry.
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