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Phylogenetic tree of NBS-LRRs in the genomes of five Rosaceae fruit species. The blue, green, yellow, red and purple branches represent genes from strawberry, apple, pear, peach and mei, respectively; pink and sky blue line indicate lineage-specific duplication and species-specific duplication events in it, respectively; light green line means species-specific duplication. The tree was artificially divided into two parts because of space limitation.
