Fig. 4. Direct comparison of rice–maize synteny. (A) Homologous sequences between the rice and maize chromosomes are displayed in an Oxford grid. Enlarged dots represent syntenic regions. The different colors for the syntenic regions are associated with each of the rice chromosomes. (B) Compacting the Oxford grid into linear maize chromosomes emphasizes the complexity of defining relationships with the duplicated rice genome. The synteny to each rice chromosome in the Oxford grid is compressed into a color highlight on the linear maize chromosomes. Multiple rows represent overlapping rice syntenic regions.