Utrecht University and the UMC Utrecht are striving to reduce the number of laboratory animals being used, and for the best use of those animals that are used, whenever possible. They also wish to increase awareness of this policy within UU and the UMC Utrecht. In some cases, researchers who need tissues can use material from animals who have already been used or are being used for another purpose. It is not always clear to researchers what is considered an animal experiment, and what conditions must be met in order to collect tissues. This policy should make it clear.