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Brassica species and the U’s triangle. Three diploid species (i.e., B. rapa, B. nigra, and B. oleracea) which represent the AA, BB, and CC genomes are shown. The other three allotetraploid hybrid species (i.e., B. juncea, B. napus, and B. carinata) sharing a combination of the basic genomes (AABB, AACC, BBCC) are also reported [22].
