See official site → interwiki about this functionality.

#---------------------------------------------
#
# Useful InterWikis for lifescience
# @author Ikuo Obataya (I.Obataya at gmail.com)
#

#---------------------------------------------
# NIH
#---------------------------------------------
pubmed             http://www.ncbi.nlm.nih.gov/sites/entrez?Db=pubmed&Cmd=ShowDetailView&TermToSearch=
gene               http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=gene&cmd=retrieve&dopt=default&rn=1&list_uids=
nuccore            http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?db=nuccore&id=
nucgss             http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?db=nucgss&id=
nucest             http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?db=nucest&id=
protein            http://www.ncbi.nlm.nih.gov/sites/entrez?Db=protein&Cmd=ShowDetailView&TermToSearch=
genomemap          http://www.ncbi.nlm.nih.gov/mapview/maps.cgi?taxid=
#mesh               http://www.ncbi.nlm.nih.gov/sites/entrez?Db=mesh&Cmd=ShowDetailView&TermToSearch=
mesh               http://www.ncbi.nlm.nih.gov/mesh/
meshterm           http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=search&db=mesh&term=
omim               http://www.ncbi.nlm.nih.gov/Omim/getmap.cgi?chromosome=
pubchem            http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=
taxonomy           http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?id=
dailymed           http://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?id=
pubchem2structure  http://www.ncbi.nlm.nih.gov/sites/entrez?LinkName=pccompound_structure&db=pccompound&cmd=Link&from_uid=
biosystems         http://www.ncbi.nlm.nih.gov/biosystems/

#---------------------------------------------
# Cell
#---------------------------------------------

dsmz                        http://www.dsmz.de/human_and_animal_cell_lines/info.php?dsmz_nr=
iclc                          http://wwwsql.iclc.it/test/iclc/det_list.php?line_id=
#---------------------------------------------
# Gene
#---------------------------------------------
hgnc          http://www.gene.ucl.ac.uk/nomenclature/data/get_data.php?hgnc_id=
#---------------------------------------------
# Protein
#---------------------------------------------
enzyme        http://www.expasy.org/enzyme/
BrendaEC      http://www.brenda-enzymes.info/php/result_flat.php4?ecno=
BrendaName    http://www.brenda-enzymes.info/php/search_result.php4?a=9&T%5B2%5D=2&Search=Search&l=10&RNV=1&RN=&T%5B0%5D=2&W%5B1%5D=&T%5B1%5D=2&W%5B2%5D=
interpro      http://www.ebi.ac.uk/interpro/DisplayIproEntry?ac=
uniprot       http://www.ebi.uniprot.org/uniprot-srv/uniProtView.do?proteinId=
pdb           http://www.rcsb.org/pdb/explore.do?structureId=
mom           http://www.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb{NAME}_1.html
ECtoPDB       http://www.ebi.ac.uk/thornton-srv/databases/cgi-bin/enzymes/GetPage.pl?ec_number=

#---------------------------------------------
icscus        http://www.cdc.gov/niosh/ipcsneng/neng{NAME}.html
icscja        http://www.nihs.go.jp/ICSC/icssj-c/icss{NAME}c.html

#---------------------------------------------
# KEGG
#---------------------------------------------
pathwaymap       http://www.genome.jp/dbget-bin/show_pathway?map{NAME}

#---------------------------------------------
# Products
#---------------------------------------------
merck         http://www.merckbiosciences.co.uk/product/
sigma         http://www.sigmaaldrich.com/catalog/search/ProductDetail/SIGMA/

#---------------------------------------------
# Scientific Sites
#---------------------------------------------
tol           http://tolweb.org/