The source of gene-encoded sequences was:
Biochemistry Department University of Triest, Italy: http://www.bbcm.units.it/~tossi/pag1.htm

Other links to databases:
Synthetic sequences:
National Library of Health Sciences, TERKKO, University of Helsinki: http://oma.terkko.helsinki.fi:8080/~SAPD/login

Peptaibols (containing unusual amino acids) was:
School of Crystallography, Birkbeck University of London: http://www.cryst.bbk.ac.uk/peptaibol/peptaibol_database_1lettercodes.htm

University of Nebraska Medical Center: http://aps.unmc.edu/AP/main.php
ANTIMIC: http://research.i2r.a-star.edu.sg/Templar/DB/ANTIMIC/
PenBase: http://www.penbase.immunaqua.com

Other links: HMMER: http://hmmer.wustl.edu/
Swiss-Prot database: http://www.pir.uniprot.org/
Gene Ontology: http://geneontology.org/