https://www.ncbi.nlm.nih.gov/Structure/pdb/4ECQ
4ECQ: Human DNA polymerase eta- DNA ternary complex: AT crystal at pH6.8(K+ MES) with 1 Ca2+ ion
DNA (5'-D(*AP*GP*CP*GP*TP*CP*AP*TP*A)-3')DNA (5'-D(*CP*AP*TP*TP*AP*TP*GP*AP*CP*GP*CP*T)-3')DNA polymerase eta2'-DEOXYADENOSINE 5'-TRIPHOSPHATECALCIUM...