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Ivanovsky Institute of Virology, Moscow, USSR
A method has been developed for selection of revertants present at low frequency in a population of fowl plague virus. It was based on the differences in elution from DEAE-cellulose columns of the original large-plaque variant (S+) and polycation-dependent plaque-size mutants (S-). It was possible to estimate low frequencies of revertants in this way.
Received 24 February 1972;
accepted 8 June 1972.
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