Vascular Tumors Induced by Polyoma Virus in Pregnant Rats 2

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Abstract
Female R rats mated with an R male and inoculated in utero with polyoma virus after “fetectomy” developed tumors. These tumors originated in the uterus and were of fetal origin (visceral yolk sac). Histologically, they were hemangiomas or hemangiosarcomas. The latter were transplantable and grew in tissue culture. Infectious polyoma virus could not be isolated from the tumor cells kept as transplantable lines or cultured in vitro. However, the tumor cells were positive for the polyoma-specific surface antigen, polyoma tumor-specific transplantation antigen(s), and polyoma nuclear T antigen.

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