The tomato Cf-9 and Cf-9B genes both confer resistance to the leaf mold fungus Cladosporium fulvum but only Cf-9 confers seedling resistance and recognizes the avirulence (Avr) protein Avr9 produced by C. fulvum. Using domain swaps. leucine-rich repeats (LRR) 5 to 15 of Cf-9 were shown to be required for Cf-9-specific resistance to C. https://www.lorenametaute.com/