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Using electron microscopy, a closed circular form of DNA (4.3 mum in contour length) was detected in the nucleus of mouse embryo fibroblasts 2.5 h after infection by Rauscher murine leukemia virus. These circles were distinguishable from mitochondrial DNA by various criteria, including size, absence of secondary features, and resistance to EcoRI endonuclease.

Electron microscopic studies of circular DNA in mouse embryo fibroblasts infected by Rauscher leukemia virus