Mercurio Diagnostic Laboratory (MDL), a laboratory that carried out diagnostic tests on human and environmental samples, was located next to Great Eastern University. MDL was unaffiliated with the school and received no federal funding. The laboratory required laboratory mice for certain diagnostic tests. The mice were purchased for MDL by Great Eastern and housed at the school until they were needed. MDL had a protocol in place for the mice that was previously approved by the Great Eastern IACUC, but because the tests were acute (i.e., the animals were given an injection of a test substance and were euthanized or died soon afterwards), the mice used for testing were brought directly from the Great Eastern animal facility to MDL, where they were used within an hour of their arrival.
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