1. Human Tumor Cell Biology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Md.
2. Human Tumor Cell Biology Branch, National Cancer Institute, NIH, Bethesda, Md.;
3. Human Tumor Cell Biology Branch, National Cancer lnstitute, NiH, Bethesda, Md.;
4. Chemotherapy, National Cancer Institute, NIH, Bethesda, Md.