Forty ade3 mutants were examined with respect to their growth requirements, levels of the tetrahydrofolate interconversion enzymes, and/or map positions. Four deletions were detected. Mutations that result in a requirement for adenine and histidine map in one region of the locus; those which result in a requirement for adenine only map in a quite separate region of the locus, a region not disclosed in previous studies. No correlation was observed between growth properties of the strains and enzyme levels.
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Elizabeth W. Jones (1977) studied this question.
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