1. Reprints: Stephen Kahn, PhD, Departments of Pathology and Cell Biology, Loyola University Medical Center, Room 0122, Clinical Laboratories, 2160 S First Ave, Maywood, IL 60153 (e-mail: skahn@lumc.edu).
2. From the Departments of Pathology and Cell Biology, Loyola University Medical Center, Clinical Laboratories, Maywood, Ill.