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Esterase isozymes were used to detect substrate-preference polymorphism in five strains of Aspergillus nidulans, and to show differential gene expression in developmental mutants in response to 5-azacytidine treatment. The medusa mutants B116, SM23, and M25 were selected in the presence of 5-azacytidine (5AC); also the G839 bristle mutant obtained in the absence of 5AC as well as the UT196 master...
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