EMBL: IEP: Tool for calculating isoelectric point from amino acid sequence, maintained by European Molecular Biology Laboratory, Heidelberg, Germany.HLA-DR Peptide Binding: Online tool for prediction, for a single letter sequence, including algorithm methodology from UCSF, Fresno, California.ISIS: Databases of BioCatalysis, Protecting Groups, Solid-Phase Synthesis, Chirbase and other chemical data, maintained at Daresbury, Cheshire, England.PenBase: Curated database devoted to penaeidins, offering comprehensive information about penaeidin properties, function, diversity and nomenclature.Peptaibol: Antibiotic peptide database and tools at Birkbeck College, UL, Bloombury, London.PeptideMass: Web-based tool for calculating the molecular weight of peptides by sequence, in oxidised, reduced or IAA forms, using its one-letter code, provided by ExPasy, Switzerland.