1. EMBL. Nucleotide Sequence Database. Available on line at:http://www.ebi.ac.uk/embl/(accessed 1 November 2005)
2. GenBank Database. Available online at:http://www.psc.edu/general/software/packages/genbank/genbank.html(accessed 1 November 2005)
3. UniProtKB/Swiss-Prot at EMBL-EBI. Available online at:http://www.ebi.ac.uk/swissprot/(accessed 1 November 2005)
4. PDB Protein Data Bank. Available online at:http://www.rcsb.org/pdb/(accessed 1 November 2005)
5. PROSITE. Database of protein families and domains. Available online at:http://www.expasy.org/prosite/(accessed 1 November 2005)