Fig. 3.

Selection of binding segments for primers that can be used to amplify species-specific sections of the MAT loci. a Structures of the MATalpha and MATa cassettes of S. cerevisiae distinguished by their Ya or Yalpha regions differing from each other both in length and in nucleotide sequence. W, X, Z1 and Z2 are conserved regions present both in the MATalpha and MATa cassettes (Haber 1998). b Locations of primers used for the amplification of species-specific segments of the MAT alleles