The a mating-type alleles of Ustilago maydis are idiomorphs.

@article{Froeliger1991TheAM,
  title={The a mating-type alleles of Ustilago maydis are idiomorphs.},
  author={Eunice H. Froeliger and Sally Ann Leong},
  journal={Gene},
  year={1991},
  volume={100},
  pages={113-22}
}
Two unlinked incompatibility loci, a and b, control mating, pathogenicity, and sexual development in Ustilago maydis, a fungal pathogen of corn. Fusion of nonpathogenic haploid cells occurs when alleles of the a locus differ; fusion products that differ at the b locus will be pathogenic and complete sexual development. The two alleles of the a locus have been cloned. The a2 allele was isolated by exploiting the close linkage of the a locus to the genetic marker pan1. Several cosmids from a… CONTINUE READING

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