title: Sites required for position-effect regulation of mating-type information in yeast.
mesh_terms: D002872:Chromosome Deletion; D003433:Crosses, Genetic; D004278:DNA, Superhelical / Q000235:genetics; D005838:Genotype; D006238:Haploidy; D009154:Mutation; D010957:Plasmids; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000235:genetics*
chemical_list: D004278:DNA, Superhelical