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Agricultural Research Council, Institute for Research on Animal Diseases, Compton, Newbury, Berkshire, England
The morphology and ultrastructure of Mycoplasmatales virus laidlawii 1, a new helical DNA virus, were studied by electron microscopy and optical diffractometry. Numerous small unenveloped rod-like particles and a few longer forms were seen in purified, concentrated preparations of infective virus, and associated with virus-infected mycoplasmal cells in culture. Observations on these virus particles are discussed in relation to their structure.
* John Innes Institute, Colney Lane, Norwich.
Received 16 February 1972;
accepted 12 April 1972.
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