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A dominant mutant of Aspergillus flavus impaired in aflatoxin production, designated afl-1 and linked to leu in linkage group VII, was recovered after treatment of conidia with N-methyl-N′-nitro-N-nitrosoguanidine. Mutant afl-1 failed to complement other non-allelic aflatoxin mutants in diploids and also restricted aflatoxin accumulation when paired with toxigenic strains in diploids. No detectable effect of afl-1 was demonstrated in heterokaryons. This gene locus is apparently not involved in the extracellular degradation of aflatoxin.
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