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- To whom correspondence should be addressed.
- To whom correspondence should be addressed.Current addresses: Dr Papich, College of Veterinary Medicine, North Carolina State University, 4700 Hillsborough Street, Raleigh, North Carolina, 27606, USA; Dr Yates, Animal Diseases Research Institute, PO Box 640, Lethbridge, Alberta, Canada T1J 3Z4, Dr Ritter, Canadian Network of Toxicology Centres, Department of Environmental Biology, University of Guelph, Bovey Bld., Guelph, Ontario, Canada N1G 2W1.