1. From the Research and Pathology Services (A.E.M., N.A., M.J.M., D.J.D.), Department of Veterans Affairs, Memphis, Tenn; Department of Pathology (A.E.M., M.J.M., D.J.D.), The University of Tennessee, Memphis, Tenn; and Pritzker Institute of Medical Engineering (C.L.H.), Illinois Institute of Technology, Chicago, Ill.