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MFα pheromone regulates morphogenesis of confronting MATa cells. The MATα wild-type (JEC21), mfα1,2,3 (WSC18), and MFα1,2,3 MFα1 (WSC56) strains were incubated in close proximity in confrontation assays with the MATa strain JEC20 on filament agar and photographed at ×100 magnification (left panels) or at ×200 magnification after 120 h incubation at 24°C (right panels).
