ENTREZ (Integrated database search for nucleotides, proteins, genomes, structures, populations sets and literature at NCBI, USA)SRS (Search EMBL, SWISS-PROT,TrEMBL, PIR, PDB, etc. at EBI, UK)
DBGET/LinkDB (Integrated database search of LinkDB at GenomeNet, Kyoto University and University of Tokyo)
SSS (Sequence and structure searching site at Berkeley, US)
Molecules R US (Full text search of the PDB database at NIH)
MIA (Molecular Information Agent searching biological databases to find the existing information about a macromolecule at SDSC, USA)
