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Special case of polyploidy when a 2n genome is triplicated to 6n.

Syntenic dotplot of grape versus itself. Each genomic region of grape is syntenic with two other intragenomic regions. This is evidence that grape is an ancient hexaploid. This hexaploid nature of its genome is shared with all other rosids and asterids (nearly the entire eudicot group). This analysis can be regenerated at: http://genomevolution.org/r/4p71