[1] UNIV MICHIGAN, DEPT INTERNAL MED, ANN ARBOR, MI 48109 USA
[2] UNIV MICHIGAN, DEPT PATHOL, ANN ARBOR, MI 48109 USA
[3] UNIV MICHIGAN, DEPT BIOL CHEM, ANN ARBOR, MI 48109 USA
[4] UNIV MICHIGAN, DEPT PHYSIOL, ANN ARBOR, MI 48109 USA
[5] UNIV MICHIGAN, HOWARD HUGHES MED INST, ANN ARBOR, MI 48109 USA