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John Innes Institute, Colney Lane, Norwich, NOR 70F, England
The properties of a mutant of cowpea chlorotic mottle virus which, although infective, cannot be disassembled in 1 M-NaCl, pH 7.5, are described. The mutant coat protein contains a lysyl to arginyl replacement which affects the hydrodynamic and titration characteristics of the virus which are discussed in regard to the anomalous ionization of a carboxyl-carboxylate pair and a lysyl residue.
* Present address: Department of Plant Sciences, University of Western Ontario, London, Ontario, Canada.
Received 19 June 1973;
accepted 30 July 1973.
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