1 Toxicology Program, Department of Environmental and Occupational Health Sciences, University of Washington, Box 357234, Seattle, WA, 98195, USA.
2 Department of Comparative Medicine, School of Medicine, University of Washington, Seattle, WA, 98195, USA.
3 Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC, 27599, USA.
4 Toxicology Program, Department of Environmental and Occupational Health Sciences, University of Washington, Box 357234, Seattle, WA, 98195, USA. zxia@u.washington.edu.