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The multidomain CCCTC-binding factor (CTCF), containing a tandem array of 11 zinc fingers (ZFs), modulates the three-dimensional organization of chromatin. We crystallized the human CTCF DNA-binding domain in complex with a known CTCF-binding site. While ZF2 does not make sequence-specific contacts, each finger of ZF3–7 contacts three bases of the 15-bp consensus sequence. Each conserved nucleotide...
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