GENERAL EC Enzyme EC Number Table GenoBase Enzyme Index ENZYME DATA BANK Enzyme Structure Database LIGAND (Ligand Chemical Database for Enzyme Reactions) MODIFYING ENZYMES By Unit Definitions for DNA/RNA Modifying Enzymes By Unit Definitions for Protein Modifying Enzymes Modifying Enzyme Suppliers RESTRICTION ENZYME DATABASES Information on restriction enzymes ATCG Restriction Enzymes Alphabetically by Site Restriction Enzymes Alphabetically by Overhang Restriction Enzymes Alphabetically by Name Restriction Enzyme Suppliers Restriction Enzyme Buffer Tables ATCG Restriction Enzyme Edition Hard Copy DNA Libraries For All by Organisms by Subgroup Commercial Library Suppliers Commercial and Non-Commercial Vector Sequence Sites (Comparative Guides for Restriction Enzymes, Modifying Enzymes, Clone Libraries and Filtration Materials) ReBase (New England Biolabs) ReBase (EMBL-Heidelberg) ReBase (Johns Hopkins) For more information see; - MEDLINE citations for REBASE 1 , 2.