1. Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, Bethesda, Maryland 20892.
2. Department of Medicine, University of Michigan School of Medicine, Ann Arbor 48109.
3. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611, Japan.
4. Klinische Atbeitsgruppe, Gosslerstr. 10 d, 3400 Göttingen, West Germany.
5. Metabolism Branch, National Cancer Institute, Bethesda 20892.
6. Genex Corporation, Rockville, Maryland 20850.