Uninducible galactose nonfermenter mutants of Saccharomyces cerevisiae have been isolated and mapped in the gal i locus. They appear to be analogous to the i(s) mutations found in the regulatory genes of the Escherichia coli lactose and galactose systems. The susceptibility to suppression by an ochre suppressor of an i allele in an i(s)i(-) double mutant suggests that the i locus in S. cerevisiae codes for a protein.
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Douglas et al. (1972) studied this question.
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