“Rats and mice, for example, tend spontaneously to develop a high incidence of tumors. This renders them unsuitable for detecting tumors. Still, no animals are used as often as rats and mice for assessing the effect of numerous experimental treatments upon the production of tumors. The reason is that they are inexpensive and take up little room.”
Source: Against a Scientific Justification of Animal Experiments, p. 355
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Deborah Mayo 6
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