Additional Residue Translations:

Beginning with ASTRAL 1.55, chemically modified residues were included
in the translation table that maps the 3-letter codes found in PDB
files to one-letter codes in our sequences.

Beginning with ASTRAL 1.57, we have also translated modified residues
in cases where the base amino acid is clearly identified in comments
in the PDB file.  Some of these were automatically parsed from SEQADV
records, while others were manually edited.  One thing in particular
to watch out for are post-translational cyclizations, in which a
single heterogen was derived from two or three consecutive amino
acids.

Beginning with ASTRAL 1.73, the PDB's chemical dictionary is used to
translate chemically modified residues, instead of the translation
table from ASTRAL 1.55.

Notes:

NH2 and ACE "residues" are not included in the sequences; in releases
of ASTRAL prior to 1.55, they were sometimes translated as 'x'.

Manual edits:
1OXFA   66  5ZA T,W,G # cyclization of 65,66,67 forming chromophore
1AT5A  101  SNN D # modified residue
1AT5A  102  ACY G # modified residue               
1WL8A  112  SNN D # modified residue
1EMKA   66  CCY S,Y,G # cyclization of 65,66,67 forming chromophore
1KYPA   66  CRG S,Y,G # cyclization of 65,66,67 forming chromophore
1KYRA   66  CRG S,Y,G # cyclization of 65,66,67 forming chromophore
1KYSA   66  CRG S,Y,G # cyclization of 65,66,67 forming chromophore
1EMFA   66  CSH S,Y,G # cyclization of 65,66,67 forming chromophore
2EMDA   66  CSH S,Y,G # cyclization of 65,66,67 forming chromophore
2EMNA   66  CSH S,Y,G # cyclization of 65,66,67 forming chromophore
2EMOA   66  CSH S,Y,G # cyclization of 65,66,67 forming chromophore
1K5RA   24  ESD S # modified residue               
1OXDA   66  NYC T,W,G # cyclization of 65,66,67 forming chromophore
1OXEA   66  NYC T,W,G # cyclization of 65,66,67 forming chromophore
1DETA	58  CGA	E # carboxymethylated glutamic acid
1XKPA	32  DMG	G # dimethylglycine
1UHDA	25  LAC	S # modified serine
1ZUEA	 2  MED	M # D-methionine