https://www.ncbi.nlm.nih.gov/Structure/pdb/5K5L
5K5L: Homo sapiens CCCTC-binding factor (CTCF) ZnF6-8 and H19 sequence DNA complex structure
DNA (5'-D(*GP*TP*TP*GP*CP*CP*GP*CP*GP*TP*G)-3')DNA (5'-D(P*AP*CP*GP*CP*GP*GP*CP*AP*AP*C)-3')Transcriptional repressor CTCFZINC ION