EXOTIC FUNGI. “In these species there are two loci that lie unlinked on different chromosomes that specify mating type. These are called the A and B MAT loci, and one encodes the homeodomain factors, and the other encodes pheromones and pheromone receptors (which locus encodes which genes depends on the species, because these loci were named historically as they were discovered genetically long before their molecular basis was elucidated).”
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