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A scenario of the evolution history of poly-u loci A and B in sunflower. O represents the common ancestral poly-u locus of UbA and UbB, whereas A′, B′, etc., stand for more recent ancestors. a, b, c, etc., represent ancestral ubiquitin genes. The X mark indicates gene deletion. In the ancestral poly-u locus, B′, genes c and e are inverted. The present-day ubiquitin genes are indicated by numbers.
