FIG. 8.

Alignments of predicted sequences of the products of chimeric alleles that were found to differ at a single amino acid and have different specificities when tested against the products of other chimeric alleles. The portion of each sequence containing the single amino acid difference (asterisk) is shown, and the specificity class of each allele is indicated on the right. The patterns of interactions for each allele pair are shown in Table 2. Note that alleles bEx87, bEx89, bEx90, and bEx92 were all designated class III when assayed with wild-type b1 and b2 mating partners. Differences in specificity are revealed in mating assays with strains carrying other chimeric alleles as shown in Table 2.