1. Laboratories of Pulmonary Pathobiology (D.C.Z., J.E.B., C.R.M., S.W.), Durham, North Carolina 27710
2. Experimental Pathology (J.F.), Durham, North Carolina 27710
3. National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709; the Department of Medicine, University of North Carolina (J.E.B.), Durham, North Carolina 27710
4. Molecular Biophysics (K.B.T., C.P.), Durham, North Carolina 27710
5. Chapel Hill, North Carolina 27599; and the Department of Pathology, Duke University Medical Center (C.S.), Durham, North Carolina 27710