SUMMARY: Mutants deficient in amino acid transport (), and unable to utilize L-glutamate as a sole carbon and nitrogen source, have been isolated. There are four unlinked genes involved: and The transport levels of certain amino acids, and the growth characteristics on certain nitrogen and carbon sources and toxic amino acid analogues, indicate that: has defective transport of acidic amino acids; has defective transport of acidic and neutral amino acids; and have defective transport of acid, neutral and aromatic amino acids. and are recessive for all three characteristics in the heterozygous diploid; and are dominant.


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