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Experimental models are conventions; the community of scientists designates, often informally, its subjects of study. Today, scientists not only breed their experimental animals; they also exercise the power to add to, delete, exchange, or mutate the animals' genes. Thus, experimental models are inventions as well as conventions. Like all inventions, they may be judged by the way they serve our needs. Books about experimental models, too, may be judged by the advantage gained by reading them.
We may divide experimental models into two sorts: analogue models and intrinsic models. Analogue models are useful as substitutes for some reality otherwise inaccessible
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