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Representative images from the visual observations from the learning phase (C57BL/6J study). This image depicts the view of the top and underside of cages containing 2, 3, and 5 mice from the learning phase of the C57BL/6J study on the day of cage change (right column). The circles and oval markings outline the ‘latrine spots’ and areas of powdered bedding sticking to the cage bottom and was scored as ‘dirty’ by observers.
