Proteins and enzymes
PDB - Protein Data Bank
Expasy Protein Database
BRENDA Enzyme Database

Metabolic Pathways
KEGG - Kyoto Encyclopedia of Genes and Genomes
Roche Inc. Metabolic Pathways

Free material requests - Online order forms
Roche Inc. Printed Materials Request: order the Metabolic Pathways Poster and other useful things
PDB: order PDB database CD-ROM version
Max Planck Forschung: kostenloses Abonnement der vierteljährlichen MPG-Zeitschrift