Overview of the functionally characterized genes in rice. (A) Genomic distribution of the 702 functionally characterized genes compiled during this study. The position of each gene is indicated by a horizontal bar; the color indicates the major category for that gene. Gray vertical bars to the right of each chromosome indicate heterochromatic regions (Cheng et al. 2001; Li et al. 2008). (B) The proportions of genes isolated by each method. (C) Numbers of functionally characterized genes in each trait category (total and by each of the methods listed in B).