This is the 12th volume in the Enzymology and Molecular Biology of Carbonyl Metabolism series. Within the text, the reader is given further valuable insight into Carbonyl Metabolism. This collection is the largest in its field of study and provides the deepest look into just three gene families. Through dozens of articles, molecular biological techniques are discussed, examining ways in which they are influencing the direction of research on Aldehyden Dehydrogenase, Alcohol Dehydrogenase, and Reductases.