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http://dx.doi.org/10.1007/BF00268625 | DOI Listing |
Individual colonies of an adenine-requiring strain of the genotype ade 2-1, SUPQ5, [psi minus] exhibit high and uniform frequencies of ADE+ revertants (5-1 times 10-5). The frequencies for strains of the genotypes ade 2-1, SUPQ5+, [psi+] and ade 2-1 SUPQ5+, [psi minus] are by contrast 1-2 times 10-7 and 0-5 times 10-7 respectively. Mutation from [psi minus] to [psi+] can occur.
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