In Benno Müller-Hill's review of the book on Adolf Butenandt (Nature 431, 246; 2004), it was wrongly claimed that Otmar von Verschuer told colleagues in 1946 of his and Gunter Hillman's involvement in the analysis of blood samples from Auschwitz. In fact, von Verschuer disclosed this information in a written report to the DFG in 1944.