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Complex housing in Marlau™ cages (Viewpoint, Lyon, France), housing 10-12 same-sex rats per cage. Marlau cages (60 × 80 × 51 cm) have 2 levels: the first level contains a big compartment with three running wheels, a shelter, ad libitum access to water, 2 woodblocks, and a climbing ladder to the second lever, where a maze has to be passed to gain access to a tube leading to the food compartment on the first level.
