The use of inbred strains as test animals can be further questioned on the basis that they often develop spontaneous tumors in organs where cancers are not frequent in humans. For example, incidences of mouse liver tumors in 2-yearold B6C3F1 mice has ranged from 17.8 to 46.9 percent. In contrast, the death rate from liver cancer in the United States is about 0.005 percent.

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