Data items in the STRUCT_CONN category record
detail about the interactions between portions
of structure. These can be hydrogen bonds, salt
bridges, disulfide bridges, and so on. The NDB
uses this category also to describe nucleic acid
base pairing, mismatches and covalent modifier
links. The value of _struct_conn.id must uniquely
identify a record in the STRUCT_CONN list. Note
that this item need not be a number; it can be
any unique identifier.
hydrog1, hydrog2
covale_base1, covale_base2
covale_sugar1, covale_sugar2
covale_phosphate1, covale_phosphate2
link1, link2