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9CFR Part 1 [Docket no. 98—043—2) https://www.federalregister.gov/documents/2000/02/09/00-2922/field-study-definition
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Sikes, R.S., Romero, L.M. What Constitutes Material Alteration of Behavior?. Lab Anim 51, 181 (2022). https://doi.org/10.1038/s41684-022-01004-0
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DOI: https://doi.org/10.1038/s41684-022-01004-0
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