[Comprehensive Biochemistry] Selected Topics in the History of Biochemistry Personal Recollections. VII Volume 42 || The Fraud of Abderhalden’s Enzymes**Nature 393, 109–111, 1998.In the two preceding papers Mülller-Hill mentioned Abderhalden’s “Abwehrfermente” in connection with the, say, “dubious” research of Verschuer and Mengele. This third paper by Müller-Hill recounts the story of these “defense enzymes” which, in fact, do not exist. The story is remarkable and instructive in more than one respect. It lasted more than half a century; it arose and was kept alive by a blend of self-deception and fraud. An overly authoritarial system (to put it mildly) is particularly prone to sustain this kind of false truths to the point of making them