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Diffraction Studies of Clover Yellow Mosaic Virus

¹ Carnegie Laboratory of Physics University of Dundee, Scotland
² Department of Plant Sciences
³ Department of Chemistry
⁴ Department of Physics University of Western Ontario, London, Ontario, Canada

X-ray and optical diffraction evidence is given which indicates that the particle of clover yellow mosaic virus has a helical structure of pitch 3.4 nm which repeats in approx. 11 turns with 11q — 2 subunits in the true repeat and with the value of q most likely to be 9. The position of the nucleic acid at 3.6 nm from the axis of the particle is deduced from the low resolution X-ray diffraction pattern.

Received 16 July 1980; accepted 21 August 1980.