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Figure 7.3. Comparison of cage design. Rat urinary aeroallergen concentrations measured when 30 rats were housed on woodchip bedding in filter-top and open-top cages, excluding those measurements made on cleaning-out days for the open-top cages. The geometric mean (GM) is indicated. (Gordon, S. et al., Br. J. Ind. Med, 49:416-422, 1992. Reproduced with permission.)17

such as a cage wash robot (and at the same time reducing ergonomics problems and allergen exposure), technicians have more time that can be used to increase their competence through more involvement in research. These workers, who have excellent animal-handling competence, could perform work procedures that would otherwise expose fresh and fumbling postgraduate students.

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