Malignant Transformation of Hamster Brain Cells in Vitro by Human Papovavirus BK 2

Abstract
Human papovavirus BK caused the malignant transformation in vitro of brain cells pr~pared from newborn hamsters. The transformed cells produced BK virus T antigen and grew as tumors after sc inoculation into hamsters that developed antibodies to BK virus T antigen. The histopathology of the tumors revealed an undifferentiated glioma.

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