A Marsupial Oncovirus?

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Abstract
A virus-like particle was observed in 2 continuous cell lines derived from the marsupial Sminthopsis crassicaudata (fat-tailed dunnart). The development of the particle was similar to the development of D-type oncoviruses. Initially, a crescent of nucleoid material was observed near the nucleus of the region of the Golgi apparatus. This crescent developed into a doughnut-shaped A-type particle which migrated through the cytoplasm towards the cell membrane where it budded either into a smooth membrane cytoplasmic vacuole or from the cell membrane. Only enveloped A-type particles were observed; no mature B-type, C-type or D-type particles were detected.