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| Figure 10. Sleeping time and liver enzyme activity changes with softwood and hardwood bedding. Mice were raised without use of bedding, moved to softwood (red cedar) for days 1-3 (trinagular points), and moved to hardwood (beech, birch, and maple mixture) for the remainder of the period (square points). Note that values return to normal by day 12. Adapted from Vessel 1967. |
