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Phylograms of the homeodomain locus (A) and pheromone/receptor homologues (B) in 8 families of Pucciniales: Araucariomycetaceae, Coleosporiaceae, Melampsoraceae, Phragmidiaceae, Pucciniaceae, Skierkaceae, Sphaerophgramiaceae and Zaghouaniaceae. Genes at the homeodomain locus (HD1 and HD2) are suspected to regulate mating compatibility in rust fungi and are present in all suborders of Pucciniales.
