Abstract
Summary
A methylcholanthrene-induced transplanted ependymoblastoma was found to be proliferating MTV virions (B particles). Identity of the particles was affirmed by thin section and negative contrast electron microscopy, by immunodiffusion precipitation against absorbed anti-MTV rabbit serum by infectivity and by fluorescent antibody microscopy of cell cultures. Cell cultures have continued to proliferate virions for a period of 10 months.
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