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mouse tissue alloantigen detected by this procedure. An antigen of cross-reacting specificity was revealed in tissue extracts of many other animal species. We next wanted to learn more about the antigen responsible for induction of postoncolytic immunity. Extracts from virus-infected tumors were immunogenic, and both active and inactive fractions of such extracts were obtained. The growth of the virus in the tumor cells was studied with the electron microscope, in the hope that this might shed some light on the manner in which viral infection transforms a poorly immunogenic tumor into a highly immunogenic one. We consider none of the questions which our work has raised as definitely solved. In fact, we are still working on many of the aspects alluded to above. When we embarked on a study of postoncolytic immunity, we were supported in this endeavor by our lack of experience in the fields of transplantation and tumor immunology.
growth immunology neoplasm transplantation tumor virus