The Third Edition of this successful standard reference work is available now. Compared to the Second Edition the the amount of data contained has tripled! Approximately 52,000 entries provide a wealth of information for the specialist in the field. The proven organization of the work in two parts has been maintained: you can search from enzyme to inhibitor (Part A) and from inhibitor to enzyme (Part B). Useful entries, e.g. on the type of inhibition or the effective concentration are given as well as comments on organisms and products and an extensive documentation of references. This impressive reference work is indispensable for every expert in life sciences, medicine and pharmacology working with enzymes.