A whole-genome optical map of rice (Oryza sativa ssp. japonica cv. Nipponbare). The 14 optical map contigs are displayed as horizontal lines representing consensus maps; their centromeric regions located by green boxes and partial boxes indicate incomplete centromeric coverage. A consensus map comprises many (29,512 maps; 14 contigs) individual restriction maps, each constructed from one (~470 kb) endonuclease digested molecule shown overlapping other molecules along the accompanying diagonal track. Chromosomes marked with an "*" indicate partial optical map contigs. Inset shows a zoomed view of a ~400 kb interval on chromosome 12 (28.19 Mb). Here, each horizontal track depicts an optical map; its "daughter" restriction fragments are consecutive colored bars and congruent fragments across separate optical maps are color-keyed. Since restriction digestion is not quantitative, some bars (restriction fragments) bear missing or false cleavage sites – relative to the consensus map – flagged by disparate colors.
Zhou et al. BMC Genomics 2007 8:278 doi:10.1186/1471-2164-8-278