Figure 1 .

Scheme of model differences for self-incompatible species with a S-Z system. Model I: any different allele at either S or Z in the pollen different from S or Z on the pistil makes pollen is compatible. Model II: any S-Z allele combination present in the pollen grain that matches the pistil makes pollen incompatible.

Aguirre et al. BMC Bioinformatics 2012 13:125   doi:10.1186/1471-2105-13-125
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