1. Departments of Internal Medicine and Human Biological Chemistry and Genetics, The University of Texas Medical Branch, Galveston, Texas, Mercy Hospital of Pittsburgh, Pittsburgh, Pennsylvania, Departments of Internal Medicine and Biochemistry & Molecular Biology, University of Arkansas for Medical Sciences, and McClellan VA Hospital, Little Rock, Arkansas, and Department of Cellular Biochemistry, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland