. "1 Regulatory and Ethical Considerations." Guidelines for the Care and Use of Mammals in Neuroscience and Behavioral Research. Washington, DC: The National Academies Press, 2003.
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The principles of the 3 Rs are also reflected in the Guide, which says that the following topics should be considered in the development and review of animal protocols (p. 10):
Justification of the species and number of animals requested.
Availability or appropriateness of the use of less-invasive procedures, other species, isolated organ preparation, cell or tissue culture, or computer simulation.