Data items in the NDB_STRUCT_FEATURE_NA category describes tertiary and other special structural features in this entry.
loop_ _ndb_struct_feature_na.entry_id _ndb_struct_feature_na.feature _ndb_struct_feature_na.feature_count rcsb000001 'intercalated base' 1 rcsb000001 'bent/kinked double helix' 1