ExPASy - Biochemical Pathways - "Boehringer Mannheim Biochemical Pathways" map on the ExPASy server (Geneva, Switzerland).
Kyoto Encyclopedia of Genes and Genomes (KEGG) - Graphical and hypertext-based information on biochemical pathways, including metabolic and regulatory pathways (for instance, cell cycle and growth factor signaling).
The Metabolic Pathways of Biochemistry - Graphical representation of metabolic pathways that are crucial to human metabolism, including 2-D and 3-D depictions.
Molecular Biology Databases - Enzymes and Pathways - Links to enzyme, metabolic and signaling pathways databases (from the Weizmann Institute of Science Bioinformatics Unit).
Proteolysis for Fun and Profit - Protein degradation resource.
Ubiquitin Index - The Ubiquitin System for protein modification and degradation.
EcoCyc: Encyclopedia of E. coli Genes and Metabolism - Encyclopedia of E. coli genes and metabolism.
UM-BBD: Biocatalysis/Biodegradation Database - Search data on biodegradation pathways, microbial enzyme-catalyzed reactions and compounds.
Metabolism Foundation - Non-profit organization dedicated to the study of plant anatomy and physiology, established by Dr. Jim Bidlack, Edmond, OK.
EMP Project , Inc. - Enzymes and Metabolic Pathways database aiming in 1999 to cover all aspects and be the most comprehensive electronic source of biochemical data from New York.