EBI category to contain details of the residue-by-residue alignment between a sequence in a PDB entry and a sequence database. Ebi Item. Annotation for differences between the PDB and SWS residue types Ebi Item. Not observed flag; Y; observed, N; not observed Ebi Item. PDB residue sequence identifier Ebi Item. PDB insert code; '_' value if not present) Ebi Item. One letter code of the residue in the PDB sequence. (set to 'X' if unknown) Ebi Item. Sequence number in the referenced database corresponding to this residue Ebi Item. One letter code of the residue in the SWS sequence (set to 'X' if unknown) Ebi Item. Secondary structure assignment (H; helix, S; sheet, T; turn; B; bulge, E; strand, ......) EBI Item. Link to EbiStructAsymAlign/AlignId EBI Item. Link to EbiStructAsymAlign/AsymId EBI Item. Link to EbiStructAsymAlign/EntryId EBI Item Integer Counter/EntryId