7D4I|1|RJ|MG|1202 MG ion 7D4I|1|Sc|ZN|101 ZN ion 7D4I|1|5K|ZN|201 ZN ion 7D4I|1|RZ|ADP|1301 ADP rna 7D4I|1|RJ|GTP|1201 GTP rna