URL

• PDBj  http://www.pdbj.org/PDBID (PDBID = 1gof, 1a00, ...)
• KEGG  http://togows.dbcls.jp/entry/kegg-DBNAME/ENTRYID
• DDBJ  http://togows.dbcls.jp/entry/ddbj/ENTRYID
• UniProt  http://www.uniprot.org/uniprot/ENTRYID
• PubMed  http://www.ncbi.nlm.nih.gov/pubmed/ENTRYID
• !Taxonomy  http://www.ncbi.nlm.nih.gov/Taxonomy/TAXID (this is invalid URL)

PDB things

•  ftp://ftp.protein.osaka-u.ac.jp/pub/pdb/data/structures/all/XML-noatom/{PDBID}-noatom.xml.gz
• /PDBx:datablock/PDBx:entity_src_genCategory/PDBx:entity_src_gen/PDBx:pdbx_gene_src_ncbi_taxonomy_id

where {PDBID} should be something like "1a00" (in lowercase).

DDBJ things

•  http://xml.nig.ac.jp/rest/Invoke?service=DDBJ&method=getXMLEntry&accession=<ACCESSION>

e.g.  http://xml.nig.ac.jp/rest/Invoke?service=DDBJ&method=getXMLEntry&accession=AL121903

Reflect for pubmed

To use reflect on pubmed:  http://reflect.cbs.dtu.dk/TEST/GetEntities?uri=http://www.ncbi.nlm.nih.gov/pubmed/20146332&entity_types=9606

The result will contain XML code like seen at  http://reflect.cbs.dtu.dk/restAPI.html