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- This work was supported by USPHS grants CA‐13038, CA‐24538, and CA‐27706.
- The authors are grateful to Wendy Shea and Michael Jarvis for their excellent technical assistance and to Doris Robinson and Tom Turnbull for their help with the animal work.
- Correspondence should be addressed to Dr. Margot Ip, Department of Experimental Therapeutics, Grace Cancer Drug Center, Roswell Park Memorial Institute, 666 Elm Street, Buffalo, NY 14263.