Codon Usage Database (Japan)

DDBJ: DNA Data Bank of Japan

EMBL: European Molecular Biology Laboratory (Germany)

Intron Databases (yeast, Exon-Intron Database, Intron Sequence and Information database)

PDB: Protein Data Bank

SWISS-PROT: protein knowledgebase

SRS: Sequence Retrieval System (European Bioinformatics Institute)