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Testing was performed for 10 min in an acrylic cage (28.5×28.5×20 cm) (TSE, Bad Homburg, Germany) divided into two equal sized compartments: one part with transparent walls, open topped and brightly illuminated (∼450 lx by a 40 W light bulb fixed 55 cm above the floor), the other part made from black plastic (passing infrared light) and covered by a lid.
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