1. Children’s Hospital of Michigan and The Child Research Center of Michigan, Detroit, Mich. 48201, and the Institute for Experimental Gerontology TNO, Rijswijk, The Netherlands.
2. Department of Immunochemistry, The Children's Hospital of Michigan, Detroit, Mich. 48201.
3. Department of Electron Microscopy, The Child Research Center of Michigan. Detroit, Mich. 48201.
4. Institute for Experimental Gerontology TNO, Rzjswijk (ZH), The Netherlands.
5. Wayne State University School of Medicine, Detroit, Mich. 48207; Associate Hematologist, The Children's Hospital of Michigan, Detroit, Mich. 48201.
6. The Children's Hospital of Michigan, Detroit, Mich. 48201.
7. Wayne State University School of Medicine, Detroit, Mich. 48207; Director of The Child Research Center of Michigan, Detroit. Mich. 48201; Chief of Laboratory Medicine, The Children's Hospital of Michigan. Detroit, Mich. 48201.